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2.
An alter is a pseudonym of an internet forum user's primary account.

An alter, as used as a secondary account, will often pen questionable messages that otherwise disrupt the community or break the forum rules.

The ancestry of the term is derived from "alternate", of which, is often shortened to just "alt".
Sarah writes her poems under an alter account.

Check his IP address and find out who's alter he is.
by Brinnie April 25, 2005
 
1.
german 4 "dude",
slang apellation
ick muss dir wat erzäln, alter!
(gotta tell ya sumthin, dude!)
by theRo November 12, 2005
 
3.
what you say when leaving an instant message conversation, and typing to0 fast. this then makes everyone seem incredibly religious.
-it's been nice talk ign to you Cindy.
-yeah, you too, talk to you ttomrorow
-yeah, alter
by boss penguin November 05, 2007
 
4.
An alter is a pseudonym of an internet message poster's primary account.

An alter, as used as a secondary account, will often pen questionable messages that otherwise disrupt the community or break the forum rules.

The ancestry of the term is derived from "alternate", of which, is often shortened to just "alt".
Jamie writes her poems under an alter account.

Check his IP address and find out who's alter he is.
by Brinnie April 25, 2005
 
5.
Common misspelling of "later"
"Alright, I gotta go dude."
"alter."
by Oplem June 20, 2005