Šukat means "to f.ck".

This is also a good example of how meanings change. Some 100 years ago, it used to mean "to search", and I think that it still has that meaning in Polish.

It can sometimes be pretty funny when you find this word in an old book. For example, there is a famous National Revival era book called Babi?ka (Grandma). The story revolves around this Grandmother, who is a kind, loving, wise old person. The book is rather sentimental, and focuses on moral values. And then, suddenly, there is a passage like this:

"Babi?ka šukala po celé sv?tnici."

That used to mean:

"Grandma searched all over the room."

Well, the meaning has changed...