half a slut
Half a slut is a girl who sleeps around but only allows oral (and sometimes anal) while saving the vagina for her husband/boyfriend.
Amy's only half a slut because Tom's the only one that's been in her vagina.
half-slut
A term used by a confused male to describe a very good-looking female who chooses to not by sluttish but gives out mixed signals. ie. NOT DTF or "worldly" but you definitely still "would".
Mate, she is FIT, yet only a half-slut I feel. On to the next...