1) Used in lieu of a word you can't remember, but whose meaning can be understood in context. Typically replaces a noun, but can be a verb or adjective if necessary.
2) Appended to a sentence to signify uncertainty, often in a shaky or questioning tone.
It's pouting out here! I wish I'd thought to grab my juber when I left home this morning.
What your Jewish friend becomes when they pick you up — in a post 2015model vehicle — promptly following an impromptu call or text
@7:45 Gretchen types ->Morty let's go to the dispensary! They just got a new strain called — Pandemic Guerrilla Panic — but Mary-Jany Fonda Gretchen's Honda Fit is in the shop atm so you can pick me up at my apartment, ya?
@7:48 Mordecai types ->Your trip is confirmed and your jUber driver Morty is en route to 730 Highland Avenue.
@7:53 Gretchen types -> Yay! You're a mench
@7:56 Mordecai types -> Morty will be arriving soon