Odd overheating problem

Hey yall. I'm hoping someone here will have some idea of what the shit is going on.

I took her in to a local oil change shop last week and the next day this started.

I pulled into my driveway after being out with some friends, didn't notice any problems the whole way there or back. Once I stopped, though, the engine barfed up probably 2-3 cups of coolant.

Couldn't tell where it came from because it coated the entire engine compartment. Seems like it was hitting the belt and getting splattered all over the place. Huge amounts of steam, Popped he hood to look and couldn't tell anything.

It was 2am and I went to bed.

Next day I started her up and let her idle for 10 minutes or so. Didnt notice any problems. Was very confused.

Drove to target. Watched Temp gauge, no issue. Parked. Engine barfs up more coolant. Less than last time, Maybe 1-2 cups.

Still couldn't determine where from.

Driving home, watching temp gauge, minor fluctuations, not too bad.

Later that day I started to go to dinner with my girlfriend, got maybe 2 minutes down the road, Temp gauge went from 1/2 (Normal) to 3/4 in 20 seconds or so.

Turned around and limped her home. When I stopped the engine this time I could hear a hissing/gurgling sound. Makes me think that the radiator does not have fluid flowing through it, probably because it barfed it up.

But the reservoir is full.

Anyone have any Ideas?

tl;dr

Radiator not cooling engine, sounds like no coolant flowing through radiator, reservoir still full. Halp.

EDIT SOLVED: Was Water Pump failure.