Filibanter;
banter that fills time; also the act of participating in unplanned banter that is so intense that two or more individuals
fail to fulfil the original intention of their meeting.
Derived from combining 'filibuster' (a word used in political
science); purposely extending debate in a legislative assembly in order to waste time and prevent a vote, and 'Banter'; general hilarity/shenanigans. So, 'filibuster'+'banter' = filibanter.
Example A:
Guy 1: "Do you remember that time we were meant to go to the
game, but we just filibantered too much and forgot to
go!"
Guy 2: "Yeah, that banter was too intense, some unbelievable shenanigans!"
Example B:
Guy 1: "Bro, we need to
kill two hours.."
Guy 2: "It's ok, we can filibanter!"