A Mayonnaise Hotdog is when a man is hitting it from the back, and right before the man cums they pull out and jizz in between the butt cheeks of the person. Then the man mashes the persons butt cheeks in between their wiener creating a Mayonnaise Hotdog.
Marshall: âYa man, last night I gave her a Mayonnaise Hotdog.â
Hunter: âYou put Mayonnaise on a hot dog? Gross dude.â
Marshall: âNah bro a Mayonnaise Hotdog is when you cum in between a girls butt cheeks, stick your wiener in between, and squish your wiener between her cheeks.â
Hunter: âOh...Noice.â