1 definition by meaniedevilface

Top Definition
A sexual practice in which both partners simultaneously insert their thumbs into each others' rectums.
"I was having sex with my girlfriend, and then she wanted to try siamese hitch hiking."
by meaniedevilface September 01, 2012

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×