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1.
The soft pink skin that covers and protects the clitoris. During full arousal the beaver helmet retracts to expose the clitoris.
I pushed back her beaver helmet to lick her clit.
by jaz October 19, 2004
 
2.
n.

a condom.

trans. v.

to sexually penetrate a vagina or female anus.

_______
American English slang, Californian Caucasian dialect, q.v.
(n.) Put on that beaver helmet.

(trans. v.) I beaver helmeted your sister last night.
by Darko October 17, 2004