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This phrase means "Cheer up" or "Don't worry, stay happy!" but I understand that it can cause howls of laughter in certain circles, I can't think why!

The pecker in question is probably not a penis, I think it may come from Woody Woodpecker? Or possibly pecker meaning your beak so equating to looking up?
Aarron blushed when his ancient relative exhorted him to "Keep his pecker up!". He didn't realise that she only wanted him to smile.

Gentle UD editor,as you edit those endless emos and chavs, keep your pecker up!

by w00fdawg October 10, 2005
51 11

Words related to keep your pecker up

cheer happy pecker smile worry