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1 definition by PurplenWhite

 
1.
to be a third (or fifth, or seventh...) wheel in a group, acting as a third wheel.
"Hey, you want to hang out?"
"Nah, I'll let you and Haley hang out alone, I'd just be too tricycle."

Man, whenever Joe hangs out with us, he's always the tricycle in the group.
by PurplenWhite May 14, 2009