And then you're stuck down inside all that guck, and it's awful.

My palm had a huge red welt, oozing and smoking with yellow guck.

She thought of the green guck with a shudder.

I made a sound like "Guck," and made myself close my eyes tight.

Picture the cavemen, he'd say, firing away, and the tyrannosauruses all gucked up in the oil puddles.