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1.
To create something worth a crest. To create something heraldic or something identifiable. To give an Identity.

Crest is a symbol/component of an heraldic display. Crestle is like an adjective for making something worth a Crest.
The tailor prayed the angel to Bedazzle the queen's clothes, the oracle prayed the angels to Crestle the new found Kingdom.
by Nico Goun February 05, 2013
 
2.
(v.) to cum in another man's foreskin and let it crust overnight.
I'm done with nestling, let's crestle tonight!
by Urban Legend June 10, 2008