A glob of mucus that builds up in your mouth until you have compiled a huge ball of snot in a pool of spit. It is almost impossible to keep it in your mouth or swallow it so the only way out is to spit out the loogey. The glob of snot will hit the ground with a satisfying plop. For maximum grossness keep the loogey in your mouth for as long as possible to build up spit and then when you spit it out it will be fucking HUGE.
Mike spit out a huge loogey and his girlfriend almost puked. A string of leftover spit was still hanging off of his lip and he had to get it off with his finger. Yummy.