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1.
The legendary hacker who made kids rage in the game All Points Bulletin.
Gamer: Fuck you OBSO1337!
OBSO1337: lol
by nonyafckingbusiness June 18, 2011
 
2.
Internet Slang - adjective - an object which is old or obsolete but which is still cool; an object which is obsolete but is in actuality much cooler than the object which has replaced it.
"My friend's old thunderbird is obso1337."
by Knight9910 January 04, 2005