cream (one's) jeans
vulgar slang To be or become sexually aroused, or to be so overcome by excitement or delight as to resemble that state. I creamed my jeans when he came onto the stage with his shirt off. I'm creaming my jeans at the thought of going to Paris this summer.
cream in (one's) jeans
1. To ejaculate in one's pants. I bet you cream in your jeans just reading Playboy!
2. By extension, to become overly excited about something. Dude, I know you're hungry, but don't cream in your jeans, it's just a candy bar.