TIEH

Stands for “that is exceedingly humorous”
A slang for posh english people

Susan: take a glance at this *shows meme*
You: that is exceedingly humorous, Susan.

tieh

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YM

Means "yeah man" or rarely, "yes madam"

Slang in the UK

Madam Susan: Shall we go for some tea, Claryce?
Servant Claryce: Oh, ym.

Gangster Thomas: Ayo mah man, Caitlin, how's it in thugcademy?? Tis' goooood?
Pre-thug Caitlin: ym!!