Tans is a term used to describe someone of a British Background or decent.It is a term used mostly by Irish People as the British soldiers i.e. Black and Tans,the color of their uniforms during the Irish independence 1921 would ran-sack villages and towns of people who didn't deserve it at all.It is used for offense today as a insult to a British person
English Men:Hello there,mates.
Irish Men: Fuck off ye dirty tans
Acronym for "Taking a Nice Shit"
Lord! I gotta TANS again.