this word is used for a sex position in which you find some random chick and tell her you want to have sex. If she gives in, you proceed to have sex with her on her back and shove your penis all the way up her vagina. Then you cum inside of her unwillingly and do not tell her your doing it. Then pretend to struggle with pulling your dick out and when you finally pull it out, scream "Behold! Xcalibr!"
Johnny told his friends that he and his girlfriend did the "Xcalibr" last night.
by Yosamma November 24, 2006