In shorthand 2-D fighting game notation, this stands for "cross up" or "cancel". A cross up is a move wherein the fighter launches an aerial attack that flies just over his opponent's head and clips him on the neck. Sometimes called a "neck hit". Quite effective but a little tricky to do. A cancel is a move that a fighter launches before a previous move is over.
M Bison can use a good cancel in the combo: Lv2 Knee Press Nightmare XX Fierce Psycho Crusher

Geese Howard can chain a good cancel in the combo: Crossup Jumping Forward, Standing Short x2, Standing/Crouching Fierce XX Deadly Rave (before last hit), Standing Short, Standing Fierce, Forward Jai-i-ken.

Scary, isn't it?
by HMB July 5, 2004
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"xX" is short for "courtland" a gospel rap artist from Louisiana.
xX is a minister of the gospel of Christ Jesus The Lord.
x = Christ
X = everlasting
also: in Mathematics the variable "X" is an unknown number
(who knows how many people/nations truly inhabit the body of Christ)... jus' something to wonder about.
in my own words:"x" also relates to mE as giving God all the glory and never seeking credit for anything He has done.
God bless

by courtland barrington January 31, 2008
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Crossed fingers for good luck in an online conversation.
Shelly: Wish me luck!!! XX
Carrie: Good luck XX
by IUhottie March 4, 2008
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The downgraded form of "XXX" (Sex) and the upgraded version of "X" (Boner).

XX is used to signify a place of masturbation, either in circles or in private sessions.
1: Hey, that sign says "XX"! Wanna go there tonight?
2: Yeah, I'll bring a few friends along.

1: Sweet! We're gonna have a wild time.
by Sethious December 9, 2013
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The most common internet name for someone who tried to use (word) but found it was already taken. Quite possibly the most retarded way of solving the problem, this method commonly leaves the user feelng as though they could have picked a better (and more original) name.
Phear me, for I am XxRETARDxX, the weakest of the weak! Thou shall died laughing at my incredable weakness, and thus, I shall win!
by DragonlordALS July 4, 2004
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A stupid over used method to display a gamertag due to lack of creativity.Indeed a "TryHard" classic.
GUY1:Hey look at the guys 23-0 score

GUY2:Hmm..it's typical coming from someone with a name such as "xX(GAMERTAG)Xx".
by onetwofour May 13, 2011
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Chick or lesbian... as in chromosomes... XX girl and XY guy..
by snake June 14, 2004
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