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1.
A funny wee girl who is suuuuuuper silly. Pilly's are usually quite cute.

Beware, pilly's can be pesky.
Haha Pilly, y u so silly?

Piiilly piiiiillllyyyy want piiiiiiiiiizzaa
by Jamal3333 May 21, 2013
 
2.
The name for a dumb person who brakes laminators.
Christina: Claire broke that laminator!
Lauren: Haha Claire's a pilly.
Claire: =( I fixed it though!
by dumbrunette.x September 27, 2009
 
3.
Little lint balls that are left on a sweater after you wash it. Usually they are removed by hand, but can be removed by a lint shaver.
After I washed my sweater for the first time I had to pick off all of the pillies.
by CaseLogic July 07, 2005
 
4.
slang word for penis, derived from the words penis and willy. Often used so that older generations don't know what you're talking about.
Emily: Simon is so fit
Alice: Yeah, but i hear his pilly is tiny.
by Pillypeople December 03, 2010