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1.
Underoos are children's cartoon underwear depicting cartoon characters. Popular cartoon characters on Underoos include Superman, Spider-Man, and Scooby-Doo.
child 1 - Check out my new underroos
child 2 - Sweet Spider-Man!
by teul2 September 25, 2006
37 6
 
2.
Underwear!!

*Note* (Usually used when refering to briefs)
Greg's under-roos are to skidmarks as canvas is to paint.
by Bent Himself June 17, 2003
31 8
 
3.
Panties, underwear, briefs and boxers: all forms of undergarments that people wear. Possible a vulgar way or slang way of saying it.
You own 30 pairs of under-roos but only really wear about 4 pairs!
by RRR June 09, 2004
5 9