When someone takes forever to ejaculate, making them similar to a snail or slug on how slow they are being. Hence Cumslug : clug
sarah : I became so bored after the 20minute mark. He took forever to cum...
Jenny : You should just dump him your man is such a Clug...
Another word used for semen (or jizz and cum). Many people use this term when the cum is over the top, and very thick. If you were to be ever be clugged on ladies, you know you’ve gave him the time of his life.
Man: Oh my god babe, I didn’t mean to cum on your face.
Women: Cum? That was clug, how much of it do you have?
A good occurrence that came at the need time.
"Wow, those notes notes you gave me were clug, I reckon I passed the test!"
Clug can mean many things, however most commonly used to describe when someone is very lackadaisical, a bimbo perhaps
"Floyd is such a clug"
"he clugs alot"