To gyeah someone is to find an ugly person or "gorm", be nice to them, and then suddenly start shouting "GYEAAAAAH" them along with some insults. This process is called gyeahing.
Gorm; iya owa u?
Gyeaher; Yeah, I'm fine thanks.
Gorm; wt ov u been up2??
Gyeaher; GYEAHHHHHHHHHHHHHHHHHHHH
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