Bunny Hugs? Hoodies? Kangaroo Jackets?

A colloquialism is an expression not used in formal speech or writing. Colloquialisms can include words (such as "gonna" or "grouty"), phrases (such as "ain't nothin'" and "dead as a doornail"), or sometimes even an entire aphorism ("There's more than one way to skin a cat"). Dictionaries often display colloquial words and phrases with the abbreviation colloq. Colloquialisms are often used primarily within a limited geographical area.

In some areas, overuse of colloquialisms by native speakers is regarded as a sign of substandard ability with the language. However, in the mouth of a non-native speaker, they are sometimes taken as signaling unusual facility with the language as they may be more difficult for non-native speakers to understand.

A colloquialism can sometimes make its way into otherwise formal speech, as a sign that the speaker is comfortable with his or her audience, in contrast to slang, which if used in formal speech is more likely done so consciously for humorous effect.

Words that have a formal meaning may also have a colloquial meaning that, while technically incorrect, is recognizeable due to common usage.

regionalism (linguistics)

In linguistics, a regionalism is a word or phrase limited to certain region.

And do you know of any really weird words exclusive to your area?

Regionalisms seem to be fading.

None of my kids use the terms "tonic", "gravy", "spa", "gools", "packie",
"hoodsie" (ice cream nor female), "elastics", "jimmies", "open air",
"bang a yooie", or "go to the basement".

And they look at me funny when I do.

Whereas all regionalisms might be colloquial, not all colloquialisms are necessarily regionalisms

George wrote:

Regionalisms seem to be fading.

None of my kids use the terms "tonic", "gravy", "spa", "gools", "packie",
"hoodsie" (ice cream nor female), "elastics", "jimmies", "open air",
"bang a yooie", or "go to the basement".

And they look at me funny when I do.

tonic as in medicine? Never use that one. Gravy as in the yummy liquid you put on chicken, turkey, beef, and sometimes potatoes seems like a pretty common word with every generation. A spa, like the place you go for mud baths and stuff? I didn't know there was another name for it. Elastics, like rubber bands? I refer to elastics as the things i tie my hair up with. but for the rest, i have know idea what you're talking about. Are your kids around my age? I'm 14.

My trendy daughter says the spelling is hoodie.

Do you know that game where you knock on a door and then run away before someone answers? Well, here in the west we call it "Knock a door ginger" which sounds far less silly when you compare it to the east's "Knicky knicky nine doors!"