Similar to pics or GTFO, a phrase used jokingly as an ultimatum to new members of a community who mention books to upload a copy or to "get the **** out."
Cassandra1980: Hi guys, you all should read the new Steve Jobs biography
P3rv69: mobi or GTFO!
Cassandra1980: =|
P3rv69: :P
P3rv69: mobi or GTFO!
Cassandra1980: =|
P3rv69: :P
by RumpoleIsDead March 5, 2012
Get the mobi or gtfomug.