Let The Beat Build Tha Carter III Lil Wayne

if i hop out, that'd be suicide

"suicide" doors on cars open opposite the normal direction of car doors. some people change their doors to open this way to look cool, but they were also standard on some older cars - dangerous with poor visibility when exiting (you could kill yourself).
It's a play on suicide doors and the fact that he says his rims are so big his car is two stories.
previously in the song, he says "the rims so high it's like it's two stories" so he's saying that his car rides so high that if he just hopped out he would be comitting suicide