Shortened from the phrase 'Bulup to your hairin' Bulup can be used to describe something when your shocked or excited.
Person one & two walking down the street.
Person 1:"watch out for that banana skin"
Person 2: *slips over on banana skin*
Person 1: "bulup!"
Person 1:"watch out for that banana skin"
Person 2: *slips over on banana skin*
Person 1: "bulup!"
by Smithy5445 August 4, 2017