When a filthy whore in the tri-state area (Mostly Atlantic city and surrounding towns) gives you a fat sloppy slippery BJ for a long long time or at least until she chokes or passes out from lack of oxygen to her brain.
Ayo my nigga, remeber dat stanky hoe from last night at Duck Town she dun gave me top long behind the dumpster
Top Long is when a bitch give you top for a long time
Damn nigga dat bitch a hoe she dun gimma dat top long ma nigga