A girl who by all appearances, actions, tastes and adventures is your lover, yet is unable to commit to being your girlfriend at the moment.
by Quasi Boyfriend September 24, 2008
A girl who has a boyfriend / husband who is not present in the physical that you date / have sex with / are in love with, until the boyfriend / husband returns.
Meghan was his quasi-girlfriend; She was only seeing him seriously until her boyfriend returned from Germany.
by Giirri April 17, 2008