A Thev can be used in multiple sentences.
It refers to a male friend/mate who cannot control his feelings towards a female companion.
He is always willing to go the "extra" mile to score with a female.
He is the one friend/mate who is always jumping from female to female, uninterested in a mutual relationship but rather a more physical one.
Get the Picture?
Hey stop being such a Thev!
You are a Thev!