When a girl blows on a guy's penis after taking a drag from a cigarette and then proceeds to stick a finger in the guy's ass and yell choo choo while blowing and sucking on the penis!

when a person takes a shit on their partner's chest and smears it all the way down their body, while smoking a cigar (yelling choo-choo is optional)

During the act of having anal sex with a woman while she has her period, one reaches under her to find the string of the tampon and gently tugs at it shouting, "Toot toot, Steamboat Willie".

when a man places his penis in a girl's ear and ejaculates.

A variation of a "Wet Willy" but where emphasis in the "Wet Willy" is placed upon saliva, the emphasis in the Steamboat variation is placed upon ass sweat.

To burrow your nose into an anus durring sexaul playtime. Also known as a Grundle.

A Steamboat Willie is a special type of sexual practice defined by the McElroy Brothers. The girl sits on the penis and proceeds to spin around quickly. When used underwater, it is a true Steamboat Willie.