Tanner is used as a synonym for the phrase 'Small Penis', it is often replaced to sound correct towards the person who is being refered to whilist insulting them in a polite manner. It is meant to be used only with people who are asian, because most often, people link the term 'Small Penis' & 'Asian' together.
Tom: Alright, here's my big ass asian Tanner, don't you just love it?
Sandra: Oh, gee, look at the time I think I have to go. Please put that Tanner away into your underwear before I puke in my mouth.
Tom: But, I'm asian, what did you expect!?
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