When a girl is going to give a guy head soon he masturbates a whole bunch without her knowledge. Then when she gives him head he's already ready to cum and cums in 5 seconds with the force of a super soaker water gun to her stunned surprise.
Guy 1: "Did Shelly come upstairs with you last night after your date?"
Guy 2: "Yeah. I gave her the super soaker surprise."
Any given Saturday when your whole crew gets absolutely wasted. The phrase is also coined to require a buddy to down their beer if they cannot recite the phrase properly on command.