I'mma 

The only contraction that is of 4 words, "I am going to." Either that or a contraction of 2 contractions, "I'm gonna." (1.)
Not to be confused with "I'm a..." (2.)

1. I'mma get me a cookie.

2. I'm a salsa addict.

I'mma by Slightly Off The Ground January 9, 2009

I'mma 

Contraction: I Am Going To

I'mma go to the bath room

I'mma by Zabrow December 18, 2008

I'mma 

Contraption of I am and gonna, commonly used bu Kanye West whilst dissing music videos.

"yo! Your mom looks like crap today!"

"shut up or I'mma smak yo' face!"

I'mma by Punkybrewer March 18, 2010

I'mma 

(Conjunction)
A conjunction of the two seperate conjunctions "I'm gonna" or "I'm going to" used as slang in text messages. Typically, in texting, the apostrophe is left out for a faster typing speed, but spelled correctly it does have the apostrophe.

I'mma go to bed now, cya

I'mma by Gerold xd April 23, 2019

I'mma let you finish, but 

"I'm going to let you finish, but..."

A phrase that one would say in the process of interrupting, upstaging and detracting from another person's shining moment.

Older lady (holding a baking sheet full of buttermilk biscuits): "These are all handmade, like my mom used to-"
Enter unruly nephew: Auntie, those are some great biscuits - I-I'm really happy for you, I'mma let you finish, but Grandma had some of the best biscuits of all time - some of the best biscuits of all time!!
Older lady: You need your ass whipped - go get me a switch!

Dude 1: 'Man this girl was so hot - she had a drink in her hand and was walking over to me at the other end of the ba-'
Dude 2: 'I'mma let u finish, but she was the ugliest girl of all time!'
Dude 1: Thanks, douche.

I'mma let you finish, but by tehbaconator September 16, 2009

I'mma-kill-a-bitch 

Another way of saying that you're going to flip out.

I swear, if that dumbass is on the bus today, i'mma-kill-a-bitch.

I'mma-kill-a-bitch by Miss Mew-Mew January 16, 2015

I'mma cop 

When you sit in front of someone with downs for 4 years and every morning he taps you on the shoulder to tell you he's a cop.

Hey buddy, hey man............. I'mma cop!

I'mma cop by P MIF February 19, 2010