Crack onto means: To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc.. It is mainly Australian English and may not be understood outside that context. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
crack onto
(slang, UK, Australian, transitive) To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc.
ˈkɹæk ˈɑntuDocumented since 1980s1980sGen Xhistorical152 viewsLast reviewed Jun 29, 2026＋ Add a definition
Etymology timeline
Born ~1980 · no dated citations yetGen X eraSee decade cohort →
Definitions
Australia
#1·Apr 26, 2026AUS
(slang, UK, Australian, transitive) To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc.
For parents
Crack onto means: To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc.. It is mainly Australian English and may not be understood outside that context. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
For ESL learners
crack onto means: To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc.. Register: very informal, slang. Suitable only for casual conversation, chat and social media. Do not use in business, academic or news writing. Common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; always check the context before producing it yourself.
Cluster: flirt
Was this helpful?
Comments
For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
Used in
Australia
Have a better definition?
Add your own interpretation of "crack onto".
💘About Relationships & Dating slang
How people talk about dating apps, modern romance, and the situationships they swear they're over — from ghosting and breadcrumbing to soft-launching, hard-launching, and the ick.
See all Relationships & Dating slang on Slangora.
Tags
Other words near "crack onto" (C)
cracklingcracknecracknutcrack offcrack oncrack one offcrack outcrackpotologycrackskullcrack snackercracktasticcrack the flags
Browse all slang words starting with C.
Related terms
People also read
Semantically related
- crack off75%
(transitive, slang) To tell a joke; to be witty.
- crack one off74%
(intransitive, UK, slang, vulgar, usually of a male) To masturbate to orgasm.
- crack on72%
(transitive, dated) To put on.
- crack on72%
(intransitive, informal) To continue apace.
- crack along72%
(intransitive, slang) To move quickly; to continue with work briskly.