Slang meaning of crack on to

crack on to means: Vrb Phrs. To come onto somebody, to make sexual advances. E.g."She was cracking on to me all night, and every other bloke at the club."

What is the slang meaning/definition of crack on to ?

crack on to means: Vrb Phrs. To come onto somebody, to make sexual advances. E.g."She was cracking on to me all night, and every other bloke at the club."