A preferable way to describe trousers, pantaloons, dress pants, etc.
Yo, that chick was digging my slacks!
Pants that are especially prone to an unwanted crotch tent
I had to wear slacks to prom, and when she kissed me i think she noticed my crotch tent
noun
A pair of full length pants, or trousers.
Nice pair of slacks you're wearing today.
Well, you never know when you might needs something on the spur of the moment for a wedding or maybe someone's graduation, or a nice date, so I'll probably take some nice slacks, a dress shirt, and a couple (of) crazy ties or two.
To play games and not show someone you like all your attention
He is slacking