When you shag someone, and never speak to them again (bag them, like bin them).
Boy 1: So you and Sarah have fun last night
Boy 2: Oh yeah, she was great!
Boy 1: You seeing her again soon?
Boy 2: Nah mate. Just that one night.
Boy 1: Oh ayee, the old Shag 'n' Bags. Nice one.
by Chantelleee. March 15, 2011
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A Shag Bag is a rucksack or other small bag which contains condoms and sex toys to be handy at any time and any place.
Let me reach for my shag bag, baby!
by Anonymous April 24, 2003
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Let's go up to my shag bag you sexy ho! I'll fuck you solidly there.
by Uncle Yusuf January 19, 2004
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A variation of the game, Marry/shag/cruise

you are given three people and have to choose which one you want to shag, bag (be naked in a bag with them for an hour) or rag (suck a rag that they have wiped their arse with.
SARAH: shag/bag/rag, Harry Potter, Rick Waller, and your mum

ABBEY: EWWWW. Gonna' have to shag Potter, bag waller, and rag my mum

RADISH: ewwwwwww u bagged Rick Waller

CHARLIE: ewww you ragged your mum! But congratz on Potter (Y)
by elizabeth1992 August 28, 2009
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To have sexual relations for one time or to make one ones own
"X for shag or bag"
by Lexifyy July 1, 2017
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