look up any word, like fleek:
 
1.
When you handle your life properly, good things happen. You would be "doin it big."
Damn your girl is fine!

Yezzir, I'm doin it big right now. I made her crank the eiffel tower last night. HOLLA
by Megatr0n the Pirate October 17, 2008
 
2.
To go hard and do it BIG
Some situations may require massive amounts of alcohol, drugs and vaginas
"Im doin it big every minute of the clock, ellyuhh ellyuh"
by DOINITBIGELLYUH September 24, 2011