Shell

The concluding exclamation in a conversation or argument whereby one person's fact, argument point or humiliating revelation will be proven untrue or ridiculous, rendering them in a state of embarrassment.

It can be also used as closure in an exchange of purposely misleading information solely to provoke gullibility.

The derivation comes from the phrase, having 'egg on your face' meaning to suffer embarrassment. Shell, would indicate ultimate embarrassment; having the egg AND the shell on your face, eventually being shortened to just Shell.

Also, Get your Shells, Get Your Shellings, Shellings and Shell on you.

The past tense would be Shelled or Shelled out.

This phrase is commonly used in South Manchester, UK

A - I had five pints last night.
B - No you didn't.
A - Yes I did.
B - John, how many pints did A have last night
John - Two
B (to A) - Hahaha! Shell.

A - Have you seen the moon tonight?
B - Yes, Professor, It's a Waxing Crescent
A - Hahaha! No it's not you fucking idiot. It's a Waning Gibbous. Shell!

A - There's your mum.
B - Where?
A - Over there, sucking your brother off. Shell

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