In your opinion, is pouring out pop, that’s left in your pop can, onto the ground before throwing it in the recycling still littering to you?

Anything man made you pour or put on the ground, in the water or air, is littering. 

I pour some out for the homies who can't be here.

That's not littering.

Coke is pretty acidic. In fact some people use it to kill weeds. Some plants would like the acid though. So you’d need to look up the plants you are pouring it on and find out. I’ve read it speeds up the composting process. As long as it does not hurt the plants in the area I think you are ok if it’s just a little bit here and there. If we are talking about rock and it somehow stains the rock - I’d say no. 

No, it is biodegradable .

I pour some out for the homies who can't be here.

That's not littering.

that depends on where you pour it because of somebody opens their car door in the parking lot space that I'm about to pull into and pours it out and I end up opening my car door and stepping in and I'm going to be kind of pissed off