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1.
To be the third wheel, to watch your friends, who happen to be a couple, commit blatant acts of PDA in front of you as if you were not even there
I rolled to the mall with Ashley and Brad, triking all the way
by Geoffrey Bailey June 27, 2007
 
2.
The act of awkwardly third-wheeling next to a random couple in a public place until they change direction or walk away.
See that couple over there? I'm gonna trike on them! It's gonna be so funny!

That kid triked on me and my girlfriend today. I wanted to punch him in the face.

Triking is hilarious!
by rockstardude777 April 10, 2012