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Its pretty much saying shame on you but in child friendly way

Its a play on words. Pelėda means owl, which rhymes with gėda, which is shame. So it’s basically „shame on you but“ on an owl because.. it’s funny and it makes sense !

Shame owl you

As others said, it means shame on you but with a nonsense rhyme. It’s a classic playground taunt. The best english equivalent I can think of is probably “liar, liar pants on fire”? It’s not exclusively about lying but that’s a pretty common usage