In the sack
Reference
Definition
“In the sack” is an informal idiom meaning in bed, especially in reference to having sex or sexual performance. It can also refer literally to being in bed.
Quick Facts
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What does “in the sack” mean?
“In the sack” is slang for being in bed, often with a sexual meaning. Saying someone is good in the sack means they are considered sexually skilled or satisfying.