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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
Sw4gga like dis
iTZ iLoGiCzzz v2
KSI Sn1p3D0vv/V

The list is endless
by BartS4177 January 24, 2010
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Aug 4 Word of the Day
Lying flat refers to a defeatist lifestyle in Chin, where people stop working, desiring material acquisition, and tap out of any social life ā€“ sometimes for good. By lying flat, young people are participating in a kind of non-cooperation movement, rather than surrendering themselves to China's oppressive work culture where they see little hope of social mobility.
Iā€™m not going to try to get a better job so I can afford to start a family, Iā€™m just lying flat.
by Freeo11 June 04, 2021
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My gamertag is Funperson123, send me a freind request on xbox live.
by JasonT January 01, 2006
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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
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
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A Gamertag is commonly known as a Username online on consle or pc but it is more commonly used on consle.
friend 1: Wow that guy has a very cool gamertag.

friend 2: Yeah I think so too!
by intuectuall January 10, 2020
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