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When a employer deliberately hires a person just to have sex with them, then fires them.
"Yo, what happened to Fiona?"
"Oh, Dennis totally shag-sacked her,"
by Dennis McInally January 26, 2009
(n) sleeping bag, nefariously used for the object of attaining carnal knowledge of its (usually) willing co-inhabitant

(n) slang : a useless or idiotic person; not to be confused with a 'bawbag'
" pardon me, you're stepping on my shagsack"
"shut it, ya useless shagsack"
by missjilly71 July 31, 2006