A female's dumfounded expression after the initial insertion into the anus. Similar to the expression post Morning Glory.
I've seen some thunder struck faces in my day, but Memory takes the cake.
The process in which you strike or hit ones head with your "Uncle Freddy" (weirdest neck name I have ever heard given ones genitalia) to gain ones attention. upon gaining attention you shove your Uncle Freddy in and/or around the mouth of the victim.
Brian: Hey Chris I guess what?
Brian: last night was great
Brian: I thunder struck Susan's fat ass while Cortney watched, it was Awesome!!
Chris: What did Rod think?