Similar to the Dutch Rudder. A male sticks his index finger into his own belly button cavity as his male friend grabs his forearm. The male friend then begins to emulate the motion of masturbation. The motion should look similar to the fingering of a vagina.
Bro 1: Hey where's your belly button.
Bro 2: Right here bro. (Bro 1 grabs Bro 2 forearm)
Female 1: What are you guys doing? It looks like you're fingering his belly button.
Bro 1 & Bro 2: We are! It's called the Swahili Rudder!
by Therealcameronpretzel November 8, 2013
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