4 da is a signal you can use to tell others that someone you know or near you is 4 da streets. the signal is throwing up a 4 with either one or both of your hands.
A rap song sung by a black alvin the chipmunk. It consists of super high pitched, squeaky voice which is most likly to give you aids. It is a still mystery of how could people understand the ancient language of the chipmunks.
To be on one to the extreme, due to the effects of drinking 4Loko specifically, or any potent, high powered malt liquor beverage in general (ie; St. Ides, Old English, etc...).
"Did you see that foo in da club las' nite? Was he on one or what?"
"On one? Shiiit... That nigga was more than on one, he was 4 Lok'd da fuk out!"