To punch someone in the undies. With your penis usually.
Me: How was your date last simo? Any undie punching?
Simo: Hell yeah, was awesome too. Plenty of undie punching to be had.
by Rodney Stewart March 13, 2008
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Little girl panties that have been worn too close to a dusty, cobwebbed crotch for too long. If someone has Krusty Undies they should think about getting some big girl panties and changing them more often.

This term is also often used to describe an adoptophile, specifically a barren woman who chooses to adopt from countries rich in child trafficking or someone who acts in a demeaning way toward all adoptees except her own child.
"WOW! She sure put on her Krusty Undies when she told that adoptee to be grateful they weren't aborted or tossed in a dumpster."
by Abandoned Abandoner September 27, 2009
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They are underwear that you can apparently eat. This is mainly just a joke, but there are things like this out there.

If someone wants edible undies, then you should know that those are FAKE. Usually.
Person one- OMG! I want edible undies like right now. Oh I’m looking at Craigslist and it says they’ve only been worn once!

Person 2- OMG yasS SUCH A GOOD DEAL! get them now it don’t matter that they’re used!
by Kihara Pseudonym April 9, 2019
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this is also called pubic fat, where someone has excess fat in their genital region giving their privates the appearance of a beer gut.
I thought my girl friend was skinny until i saw her naked and realised she had an undy roll
by Don Gulliver May 8, 2003
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When you wear your last chance undies two days in a row because you forgot to do laundry...again. They can be worn either in a normal manner, or inside out to produce a psychological effect as to thinking you actually have clean undies on; Or because you have skid marks and or piss stains.
Nigga to mom "THIS IS AN EMERGENCY! I GOT A DATE AND I HAVE ZOMBIE UNDIES ON B...ITCH!!"

Mom to Nigga "You disgusting fucking pig of a son!! I TAUGHT YOU BETTER! NIGGA!"

See also Last chance undies
by Inimical420 September 7, 2011
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To get lucky. A phrase used the day after when regaling friends of your sexual exploits.
Dunco: So did you pull undies last night mate?
Dawdo: Yeah, I pulled undies with that Swedish chick.
Dunco: Nice.
by Dunco September 15, 2005
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the undies made of cotton that are the stuff of real legend worn by 200kg ugly as fuck woman with queensland blue pumpkins
see putrid
dam it i just follwed through on that one

LEST WE FORGET
by Mark August 7, 2004
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