This one-liner may be used during an alien invasion, especially when you're a badass who is out to kill the beasts from outer space.
It is also possible to get the phrase as a dirty joke, according to the youtube celebrity Jesse Cox from the youtube channel "OMFGcata", who first came up with this sentence during his playthrough of the game "Crysis 2".
You killan alien with your mere hands. You mention that you are choking a squidhead. You throw his corpse away.
A blow job performed by a midget or little-person who is being held upside down by their ankles like a "choking baby". Once the midget is mid-fellatio, you start slaping their back, like you would a choking baby, trying to dislodge your penis in this case, instead of an animal cracker.
Bro- Junior hooked up with the midget receptionist from Accounting. Said he picked her up by the feet, held her upside down and then she started blowing him!
Homeboy- NO WAY! He got a Choking Baby BJ? Good for him!