shag piece 

someone you use for sex, like a fuck buddy

sorry can't come tonight, going round the shag pieces

shag piece by thefashionprincess August 23, 2011

shagpiece 

a boy or girl with whom an individual just sleeps with randomly with no other basis for the relationship than just sex.no strings, no commitment, no emotion, just a bit of fun

hes not my boyfriend hes my shagpiece

shagpiece by loopyloo December 24, 2004