The act of burping into your partner's anus. Said burp then gets farted back into your mouth. The process can then be repeated for a dual-exhaust bonus.
Farting into your partner's mouth and then having them burp your fart into your mouth or your anus also constitutes as a french tailpipe.
"That french tailpipe smells like poop but tastes like lunch!
15👍 7👎