To give someone a quick little kiss when they aren't expecting one. You have to be bold to steal a kiss.
Boy: "What would you say if I were to steal a kiss when you're least expecting it?"
Girl: *steals a kiss*
this is kind of hard to describe, but it's a way to describe someone of the opposite sex that you find gloriously attractive...when someone of the opposite sex is so gorgeous that they make you stand there, mouth hanging open, totally dazzled
That guy has some serious razzledazzle.