ass crack
North American vulgar slang for the gluteal cleft — the vertical groove between the buttocks.
Seen in the wild
When you have long hait and you pull a strand out from your ass crack. Maybe steve starts pulling and finds lint on the end
#NewVideo dropped ☔️Ass Crack & Low Rise Jeans:: Cleaning check it out now at #YourVids https://yourvids.com/vids/ass-crack-low-rise-jeans-cleaning#mBm9Ft @yourvids.bsky.social
unfortunately this was roughly as far off the mark as the middle of the lumbar spine because it was like, right smack dab in the middle of their ass crack, maybe even slightly lower
Definitions
North American vulgar slang for the gluteal cleft — the vertical groove between the buttocks. Used both in literal anatomical contexts (usually disparagingly, e.g. a tradesperson's exposed lower back) and in figurative expressions of very early time, as in 'ass crack of dawn'. That particular idiom intensifies 'crack of dawn' for comic effect, emphasising an ungodly hour. The term is blunt and informal, common in everyday American speech despite its vulgarity.
The plumber bent down and I had a full view of his ass crack — I've never wanted a longer shirt on a man more in my life.
Comments
North American vulgar slang for the gluteal cleft, the vertical groove between the buttocks. Used descriptively in anatomical conversation, fashion contexts involving low-rise clothing, or as a colorful time marker in the phrase ass-crack of dawn, meaning extremely early. That idiomatic usage — the ass-crack of dawn — is arguably the most commonly encountered form in contemporary speech. The compound is used across a broad range of formality levels — from medical professionals noting gluteal cleft positioning to friends ribbing each other about revealing waistlines.
They started construction at the ass-crack of dawn and woke up the entire street.
Comments
(North America, vulgar, slang) The gluteal cleft.
“When you have long hait and you pull a strand out from your ass crack. Maybe steve starts pulling and finds lint on the end”
“unfortunately this was roughly as far off the mark as the middle of the lumbar spine because it was like, right smack dab in the middle of their ass crack, maybe even slightly lower”
“When you have long hait and you pull a strand out from your ass crack. Maybe steve starts pulling and finds lint on the end”
— Bluesky· May 2026“#NewVideo dropped ☔️Ass Crack & Low Rise Jeans:: Cleaning check it out now at #YourVids https://yourvids.com/vids/ass-crack-low-rise-jeans-cleaning#mBm9Ft @yourvids.bsky.social”
— Bluesky· May 2026“unfortunately this was roughly as far off the mark as the middle of the lumbar spine because it was like, right smack dab in the middle of their ass crack, maybe even slightly lower”
— Bluesky· May 2026
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- butt crack87%
The American slang term for the gluteal cleft — the vertical groove between the buttocks. It's casual and mildly crass but widely understood across age groups, appearing in everything from kids' schoolyard teasing to adult comedy. The term is most often invoked when someone's pants ride low enough to expose this area, which has spawned countless jokes and even a few viral moments. "Butt crack of dawn" is a playful extension of the term used to describe an unreasonably early morning hour.
- butt crack81%
(US, mildly, _, vulgar, slang) The gluteal cleft.
- buttcrack80%
American informal slang for the gluteal cleft — the vertical crease between the two buttocks. It's a universal, deeply unsexy term that appears in complaints about low-rise jeans, plumbing jokes, and any situation where someone's backside is more visible than intended. Buttcrack is one of those words that exists primarily to make people groan or giggle, and it does its job faithfully every time.