Top Definition
One sexual partner is positioned above another (On top of a ladder or balcony) and has a bowel movement. For the French Grenade to be completely successful, a good portion of the stool must land in the other sexual partner's (reciever) mouth. The reciever must be lying on his/her back on the floor.
When your father got home from the war, he gave me a French Grenade, then he gave me a kiss.
by KILTSNIFFER69 January 28, 2009

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