Sumsum2420's definitions
A girl or boy who is a permanent "booty call" or "friends with benefits" with someone inbetween relationships!
" me and claire just broke up!"
" oh it's okay I'll be your inbetweenie until you find another girl"
" oh it's okay I'll be your inbetweenie until you find another girl"
by Sumsum2420 February 19, 2017
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