To smile for ever, to always be smiling
Mango's a pretty happy guy, he's in a constant state of grinfinity
by John Mangan October 26, 2007
Top Definition
Adjective meant as a replacement for the word "great" (Gr8) but with greater intensity, having the magnitude of infinity.
Boy: Wanna hang 2nite?
Girl: That sounds Gr8 :)

Boy: More like Gr9.. or Gr10
Girl: How about Grinfinity?
Boy: Alright easy now, i don't like you that much.
by Tosh Jimpko March 06, 2014
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