British slang word for muscular or 'strong-looking'
it has been used to describe girls as hot as well nowadays. It acts as a double for the word 'fit' :)
Girl: Oh he's so tonk, did you see him at football with his shirt off.
Pronoun. Used as a jargon term better Border Patrol Agents to describe someone who is present in the United States illegally. (Exception: Some Dim-witted TCA PA's use the term UDA, even though most TONKS are well documented in IDENT as illegal.)
"Grab that guy over there in the Cowboys jacket. He's a Tonk too."