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8.
The spot between your legs, also know as shaft and glans.
I have two tricycles
by Nathanaial August 14, 2008
 
9.
Version of the term trisexual/trisexuality.

To be sexually attracted to/involved with men, women, and animals (not necessarily all at one time & place, but the more the better.)

Comes from the idea of there being three wheels on a tricycle, one for each origin of lover.

Typically occurs during freak nasty orgies and barnyard hoedowns.

Very popular amongst teens in Oklahoma and surrounding areas.
girl: so...are you tricycle?

boy: uh, what is that?

girl: oh silly, it's like being bisexual + beastiality! meow...
by h*dog October 25, 2006
 
10.
A threesome, sexual in nature or otherwise.
"Where's Josh?"
"Man, the motherfucker's doing a tricycle with Melly and Sarah"
by CaptainBronson August 25, 2014