Top definition
The act of yanking someones top down to reveal their bra. To welly someone takes alot of stealth and the victim must be taken by surprise for it to be counted as wellying.
Guy 1: Wtf just happened??
Guy 2: I think that girl just got wellied by her friends!


Guy 1: Where were you most the night??
Guy 2: I was following this girl round wellying her... she had the biggest tits ever!
by DI Girl November 14, 2010
Happy St. Patties Day!