Top Definition
a high power stealth ejacualtion move peformed on your girlfriend when she is sleeeping, then photographed.
Wait until your girlfriend is sleeping and then creep up using extreme stealth before wacking one off (cumming) onto her forehead. Allow to drip, then dry before taking a sneaky photograph that is then shown to her the following day. This is the "the sleeping avalanche".
by iceman_36 May 03, 2007
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