a 'friendship' based on ass.
different than FWB
because in that situation you tend to be friends first then benefits come along. but in an ass-ship, its jst a friendship because of the fact that there is ass.
its almost like that one guy/girl that u never talk to as a friend (like call to hang out or even talk to) but u know that it is an ass-ship cos u can call them up for some chitty chitty bang bang.