mudder boat 

The action of motorboating between the buttcheeks.

I motorboated her boobs last night. Oh yeah! Well I did a mudder boat in her ass!

mudder boat by The J-Radman July 24, 2007

Murder Boat 

Like a Motorboat but with a menstruating vagina.

Let’s put a towel down and let me give you a murder boat baby.

Murder Boat by Pside23 December 12, 2021

Murderboating 

The act of motorboating a woman's large cleavage and then getting choked (possibly to death) by said cleavage.

"You want to bury your face between my tits?"
"Sure, as long as you're not murderboating me"

"Hey have you seen Kyle lately?"
"Haven't you heard? He got murderboated last week!"

Murderboating by Pluto is not a Planet March 14, 2020

Mudderboat

When you perform a motorboat between a girls ass cheeks and she has diarrhea

But this chick was so hot last night I gave her a Mudderboat. The corn was delicious !

Mudderboat by Starkastic June 30, 2016

mudderboat

The act of taking a shit on a woman's chest, then pushing one's face in between the shit covered ample breasts, and rocking one's head side to side while making a rapid lip moving motorboat engine sound.

Similar to a motorboat with the addition of the feces.

Did you motorboat that girl with the big tits?
No man, I had the runs so I did a mudderboat instead!

mudderboat by Rok Mriscan January 2, 2009