To masturbate or to pleasure yourself with lubricant. Often done with water or more extremely done with such things as butter.
"I'll be sweet to go out after squash!! I just need to go for a sloose"
"Those slamming hotties were so fine I could sloose right here with this tomato sauce!"
a slut, that's loose.
"You slept with half the soccer team? You're such a sloose."