when you eat too much sugar coated candy your tongue will get all gross and things will taste weird for a short time.
damn joey, if you keep eating those sour patch kids you're gonna get sugar tongue!
When you've been eating pussy or cock and your Tongue gets cum (aka sugar) all over it.
Ryan: Man I was eating so much pussy last night I got a sugar Tongue!
Brendon: I know what you mean dude, I get a sugar Tongue every night.