To have sexual intercourse with a girl. It's when you stick your erected penis into her anal cavity while she is taking a wicked dump; you're penis will normally come out stained brown with her own shit
"Dude, did you get laid with Harmony? "
Kid: "yeah, but my dick came out a mud pup when I did anal with her."
"Damn bro that's pretty gnar"
Kid: "yeah, but my dick came out a mud pup when I did anal with her."
"Damn bro that's pretty gnar"
by AlGoregasm March 04, 2015
Do your mud pups hang low? Do they wobble to and fro? Can you tie 'em in a knot? can you tie 'em in a bow? Can you throw 'em over your shoulder like a Dr. Dangles soldier? DO YOUR MUD PUPS HANG LOW?
by Sophie Spitz March 22, 2017