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A small fold in a piece of material that when rubbed between finger and thumb retains its shape and often moves along the material. Usually found on denim jeans when in a sitting position.

'Birdwirping' is the act of 'Snuggling' the Birdwirp. Can be tremendously annoying for the wearer. Usually pleasurable for the 'Birdwirper'
I've found a 'Birdwirp' on your jeans. Let me 'Birdwirp' it.
by Mark Griffin September 26, 2006
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