In spoken languages, reduction is a way to pronounce a certain word or phrase more quickly than usual. For example, in English language

hella and helluva (hell of a)

getcha (get you)

betcha (bet you)

doncha/don't cha (don't you)

gotcha (got you)

waddya (What are you...?/What do you...?)

gotta (got to)

hafta (have to)

hasta (has to)

wanna (want a/want to)

wannabe (want to be)

gonna/gunna (going to) used fot the going-to future

oughta (ought to)

kinda (kind of)

kindsa (kinds of)

lotta (lot of)

lotsa (lots of)

outta (out of)

gimme (give me)

lemme (let me)

I dunno. (I don't know.)

coulda (could have)

shoulda (should have)

woulda (would have)

mighta (might have)

musta (must have)

watcha (what are you?/what you)

While most reductions crop up regularly and easily in informal speech, there are also some extreme examples which can be used intentionally, sometimes for ironic or comedic effect.

Ima (I am going to, by way of "I'm gonna")