verb: to sneak up behind someone, grab their underpants, and yank them forcefully upwards causing their underpants to get jammed up way deep in their butt crack.
dude, did you see what happened to that new fat kid on the playground? He got a grundy so hard it ripped the elastic off his nuthuggers!!!
by shellacked June 17, 2008
by M January 27, 2004
by StillBorn May 01, 2003
by peter grundy February 08, 2005
1 vb. To run very fast wearing only one's boxer shorts.
2 adj. To be in one's grundies - to be wearing only one's boxer shorts.
3 noun. Grundyboy - James Halsall.
4 adj. grundy - you can replace pretty much any word with grundy and come out with something that sounds like it should make sense, but doesn't.
5. adj - grundy. to be as of or pertaining to the action of running very fast wearing only one's boxer shorts.
2 adj. To be in one's grundies - to be wearing only one's boxer shorts.
3 noun. Grundyboy - James Halsall.
4 adj. grundy - you can replace pretty much any word with grundy and come out with something that sounds like it should make sense, but doesn't.
5. adj - grundy. to be as of or pertaining to the action of running very fast wearing only one's boxer shorts.
1. I got pulled over by a policeman for grundying down the A65 (true story)
2. I was in my grundies all day Sunday.
3. Hey, Grundyboy! How are you doing?
4. That concert was pretty damn grundy.
5. Running very fast wearing only one's Y fronts is a bit grundy.
2. I was in my grundies all day Sunday.
3. Hey, Grundyboy! How are you doing?
4. That concert was pretty damn grundy.
5. Running very fast wearing only one's Y fronts is a bit grundy.
by bslsthgrt - The Grunder In Chief June 22, 2005
"Oh shit, son. I took a massive Grundy in Maria's bathroom. I dare ya to light a match!"
"Why are you telling me about your shit, bro?"
"Why are you telling me about your shit, bro?"
by infamous weezer January 08, 2012