A person who just because made friends with someone who say they are "straight edge" Has now just suddenly turn/became straight edge. When he/she drinks,has sex all the time,does drugs,or cuts themself. And if their friend stops being straight edge they will too.
strait edge poser:" This guy really likes me because he knows that I'm straight edge"
non straight edge person: "What do you mean, you have cuts all over your body and you got totally wasted last night."
straight edge poser: "Shut up! *takes ecstacy pills*