FBIncest

When two people are classified as family members on Facebook, but are known to hook up occasionally.

They always hook up but they're"brother and sister" on fb! Talk about FBIncest.

by sydlesk March 07, 2010

Fucklock

When a woman tightens the muscles towards the opening of her vagina to "lock" the man's penis in place.

"She totally pulled the fucklock on me."

by Sydlesk April 29, 2010