Said when one accomplishes an unlikely feat, or does something impressive.
Is said with shoulders at 90 degree angles form the torso, and forearms angled in towards each other, index fingers pointed in a pistol gesture, and moving the forearms up and down with the elbows as the fulcrum. forearms move thusly: one going up, and one going down. Repeat until you stop saying the word.
It is said holding the long 'e' sound as long as desired, all the while, performing the above motion.
Jason: "So did you hook up last night or what?"
Sam: "Dude, she invited her friend to join us too. BLEEEEEEEEEEEEEGH!"