hella
Means 'really', 'super', or 'a ton of'. It's classic Bay Area and NorCal slang, and you can put it in front of an adjective or a noun.
That concert was hella fun, but there were hella people in line.
#regional
Slang tagged #regional.
jawn
Philly's all-purpose word that can mean basically anything: a thing, a place, a person, or an event. It works like 'thing' or 'thingy', and you figure out what it means from context.
Grab that jawn off the counter for me, and let's head to the jawn on South Street.
wicked
In New England, especially around Boston, wicked just means "really" or "super." You put it in front of an adjective to crank it up, and it has nothing to do with being evil.
That lobster roll was wicked good, we have to come back here.
yinz
Yinz is how folks in Pittsburgh and Western Pennsylvania say "you all" when talking to more than one person. It works just like "y'all" does in the South.
Are yinz coming to the Steelers game on Sunday or what?