Top Definition
When one man inserts a portable pocket vagina into another man's rectum and has sexual intercourse through it. It is often considered to be a heterosexual act because, if done correctly, will result in no skin-to-skin contact.
My friend Tom Cruise and I struck out at the bar, so we decided to friendship sock to fulfill our drunken sexual urges.
by iyaoyasao2 June 06, 2010

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