From Longman Dictionary of Contemporary Englishgo funnygo funnyinformalBROKEN if a machine, piece of equipment etc goes funny, it stops working properly I just turned it on and the screen went all funny. → funny
Examples from the Corpus
go funny• Then came the road where her knees went funny.• My eyes go funny after a bit, so I look at summat else.• I tend to sit there going funny colours.• And his eyes went funny just as he was about to change personalities. 