When a girl gives you a rim job, and then immediately after she starts making out with you. Later, you discover your own fecal matter on your upper lip, resembling a Hitler stache.
“Hey bro beans, you’re lookin an awful lot like Hitler right now. What’s that on your upper lip?” - concerned friend
*Rusty Pontoon victim frantically checks upper lip*
“Oh my god…. It tastes like poop” - Rusty Pontoon victim
“Didn’t you just come from your girls house? Did you give her a rim job or something?” - concerned friend
“No… she gave me a rim job. Why?” - Rusty Pontoon victim
“Please tell me that she didn’t start making out with you immediately after.” - concerned friend
“Yes she did.” - Rusty Pontoon victim
“Oh shit, you just got Pontooned, you got Rusty Pontooned.” - concerned friend who has seen this plenty of times