Stuffing the Envelope Share definition Flag The sexual manuveur to take one's cock and balls and put or stuff them both into the woman's vagina. Man, the new bitch at the office is so loose I ended up stuffing the envelope last night. Stuffing the Envelope by Yerby August 17, 2006 0 0 Get merch Get the Stuffing the Envelope mug. Buy Now — $32.95 See more merch