When a guy goes to the movies with a girl and orders a bucket of popcorn, and you cut a hole at the bottom and put your junk into the hole, when she reaches in she will find a nice surprise.

Performing fellatio with the aid of "pop rocks" candy.

when a man covers his penis in poprocks then dips it in soda then procedes to screw the womans vagina.

(v) putting pop rocks on your dick to make her pussy vibrate and pop