This is straight from Russian: "Blatt" is
slang for a
hooker. It is also a very insulting curse word, regardless of it's meaning, and a word that is used to express frustration or anger (much like "Fuck" in English). Since it's use is so common by some who speak Russian, it became very popular and common in Hebrew
slang as well, for the same reasons described under Gandon.
"Blatt! I can't open this
box..."
"Blatt! He
won't answer the phone!"
"And then Blatt I went to the
store Blatt and told the clerk Blatt give me Blatt the goddamn chewing gum Blatt!!"
(extreme example)