Yeuk is a 15th century Middle English word used by the Scots meaning "to itch". When not used as a verb, it is may be used to identify a particular sensation, i.e. the irritation of nerve endings in skin or mucous membrane that provokes the desire to scratch oneself silly if alone or look for a speedy exit if one is in mixed company. It's also a popular name for the parasitic disorder "scabies".
She's the wife of Greek philosopher Socrates who was known for her bad temper. Now the term is used to signify a shrew or surly spouse (who more often than not thinks children should neither be seen nor heard). See also Greek.
A person who loves to use extremely long words (oh the irony).