Gym and bodybuilding slang for the deltoid muscles — the three-headed shoulder muscles responsible for raising and rotating the arm. A primary target in upper-body training, and visible deltoid development is considered a marker of a well-built physique. The term is standard in weightlifting culture and widely understood beyond dedicated lifters. Often used in compound phrases: rear delts, side delts, front delts.
His delts were so developed that shirts always looked tight across the shoulders.
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(bodybuilding, slang) The deltoid muscles.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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