Top Definition
1) the extreme level of not giving a fuck that prolonged exposure to tropical island paradise can cause.

2) a temporary transition to "island time" or a slowing down of thought process caused by prolonged exposure to tropical island paradise.
guy 1: "hey can you help me with the math project?"

guy 2: "sorry bro, i got the island brain goin on"
by longjohnawesome April 25, 2011
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