Commonly used as a derogatory insult against a person from, or resident of The Upper Peninsula of Michigan.
FACT:they pronounce 'three' as 'tree'.
FACT:they say "eh" a lot too.
Lower Peninsula of MI Guy; "get the fuck outta my driveway!!"
Uuper Guy; "Eh uh, ya know I was just bring ya a bunt cake, eh?"