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A slag, who after a variable amount of time, is in fact deemed to be in a bag.

Being 'in' a bag could include - living, shitting, having intercourse within the confines of a bag
'Who is that milling around the place? Is it just a fool?'
'No, it is rather a slag in a bag'
by claireandbryony March 31, 2010
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2
*This word was made by ola*
A slag in a bag is a hoe that should be put in a bag to be restrained after sleeping with too many men.
β€œRachel keeps sleeping with all my boyfriends”
β€œEw, what a slag in a bag”
by Ak47777 November 07, 2019
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