To burrow your nose into an anus durring sexaul playtime. Also known as a Grundle.
The key to any good Grundle or steamboat willy is copious amounts of ass sweat.
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Jessica is such a THOT i heard she gave everyone on the football team a steamboat willie
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When a person takes a massive rip of a vape, and then blows it ont/into the other persons genitals while giving head.
Dude #1: Bro, I was fucking this fat chick Sarah, and I gave her a steamboat willy
Dude#2: The fuck is a steamboat willy
Dude#1: Just check the urban dictionary
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