When you have sex on a beach and you get sand on your penis and don't wash it off before penetrating the vaginal cavity.
by Lance_Uppercut May 6, 2009
Get the Sandtrapmug. the vaginal cavity of an asian woman
by theguydownthestreet December 24, 2007
Get the sandtrapmug. by negroshima January 27, 2007
Get the Boston Sandtrapmug. When engaging in rough sexual intercourse on a sandy beach, the male sticks it up her anal cavity and continues with anal until he goes inside her rectum. He continues to pull out quickly leaving the loose anus open and throws in a handful of sand off the beach. This combines with the already present semen to form an unstoppable cement-like combination which when dry, the female will later refer to as a fire in her asshole.
by DsTRO June 6, 2004
Get the flaming sandtrapmug. by Gangsta117 December 19, 2008
Get the Dirty Sandtrapmug.