picksack in/out . sack in/out {v.}, {slang} To go to sleep for a prolonged period (as in from night to morning). Where are you guys going to sack in/sack out? Categories: add yours slang verb Source: A Dictionary of American Idioms 'sack in/out' on video BODYWEIGHT SHAPE & TONE 12MIN WORKOUT » ATFAC DAY 1 sort: relevance, mode: exact match, q: "sack in/out", maxResults: 4, videoEmbeddable: true, videoSyndicated: true, safeSearch: strict, type: video Subscribe to: American IdiomsEnglish Slang Post my comment