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1.
A gamertag is a person's online persona over xbox live.

You need to pick it wisely as Microsoft will try to get as much money from you as possible because it costs 10 dollars to change it.

Also there are unwritten rules when it comes to creating your gamertag.
Rule #1: It may contain at least 1 marijuana reference.
Rule #2: It may or may not (your choice) reference alcohol or boobs.
Rule #3: It must have 3 x's somewhere in the gamertag (perferably at the beginning and the end)
Rule #4: If you are 12 years old and are planning on playing halo 3 all day after school until your bedtime you must put MLG in the beginning of your gamertag.
Rule #5: You must, MUST make it look you're so retarded that you spent your whole time as a baby in a washing machine.
Here are some examples of gamertag you might want to use.
xXx LeGiiT SniiPeZ
PRO SN1P3R BR
Sw4gga like dis
xxxw33d4l1f3xxx
MLG 4 SH0T
iTZ iLoGiCzzz v2
iPolariiZee
KSI Sn1p3D0vv/V

The list is endless
by BartS4177 January 24, 2010
116 24
 
2.
An Xbox Live username.
My gamertag is Funperson123, send me a freind request on xbox live.
by JasonT January 01, 2006
113 54
 
3.
An online persona over the popular Xbox LIVE feature on the Xbox 360. You have to have a maximum of 15 characters consisting of numbers and letters, but it must start with a letter.
x iCaMPeR
x SaTaNiiCc
II TaLeNTz v3
x NeRv3 x
XXXXXXXXXXXXXXX
x1337 N05c0p35x
iTz 2 Pr0
o iPRoShoT xX

"I got a new gamertag today."
"My gamertag is so pro x MLG (joke)"
"Whoa, that gamertag is leet"
by Spanky McShif February 21, 2009
48 22