Refers to your "reaction" when a gal playfully yanks your hoodie-strings to clinch up the hood around your nose and cover your eyes, and then pulls down your pants, causing Mr. Happy to "rise to the occasion" with the knowledge that something wonderful is about to happen in his general vicinity, even though you can't visually determine what activities the cutie has in mind.
Horny stud: I always get a major hoodie-woody wheneverTiffany pulls the bonnet-strings on my jacket, since I know she's got a killer blowjob in store for me.