Prior preparation is required. The male must buy a bottle of mustard and hire Ken Griffey Jr. giving him specific directions. Then, while the male is having sex (doggystyle), when he ejaculates in his partner, he gives the signal to Ken Griffey, Jr. who is presumably hidden in the closet. Ken Griffey, Jr. then bursts from the closet spraying mustard in the eye of the male's partner. Having Ken Griffey, Jr. announce himself at the same time is optional.
Dude, I can't go out this weekend. I totally gave my girl the ol' Ken Griffey, Jr. mustard surprise last night, so I have no money after hiring Ken Griffey, Jr.
by Leemanmasteroftheuniverse August 20, 2009
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