phrasejack
The act of stealing another person's witty catchphrase or invented term to make oneself seem smarter and hipper.
"Dude, that party was crowded and boring. It was funvoid."
"Man, you just phrasejacked Bud! 'Funvoid' was his word!"
"Man, you just phrasejacked Bud! 'Funvoid' was his word!"