Reverse Commute

During a threesome (one guy, two girls) after the deposit has been made into one girl, the other girl immediately sucks it out.

Alternative Definition: Two guys bring home two girls from the bar (one hot, the other a granade or 'Grimbo'). They are all having sex in the same room and the guy with the hot girl is experiencing the 'Reverse Commute' since he is in a far better postion than his mate on the other side of the 'highway'