Was playing a 4nl game on juicy stakes and the following happened

6max
UTG(technically MP2 cause its 6max) limps
folds to me
I raise on button to 4bb
blinds fold
UTG 3 bets to like x3 or x4 my raise or something

ive seen this a couple times and i just don't know what to make of it.

Was UTG just trying trap expecting button to reopen betting with a raise?