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If a parcel has been delivered to you via clenched bumcheeks, it is said to have been delivered in a 'bumvelope'.
My sandwidge arrived in a bumvelope.
by David Hogan March 20, 2007
An envelope full of roaches and bud scraps that is given to a bum
Where should I put this out?

Oh no, put it in the Bumvelope!
by Bleezy503 April 26, 2011