Egg on yer chin

exp.

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A phrase used to discreetly tell someone that their flap is open or their fly is down.

In use

Youssir, 'scuse me but dayer's egg on yer chin boy, an' all de yungwans over dayer are burstin' dayer holes laughin' atcha'

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Ah, welcome back. Or welcome. Either way, welcome. Would you like me to translate 'Egg on yer chin' in use for you?

Excuse me, sir, but your fly is undone, and all the young ladies over there are in fits of laughter at you.