The act of placing one's leg up in a way so as to mirror the pose of the 17th-century Welsh privateer of the Caribbean, Sir Henry Morgan while masturbating, without pants, or otherwise miming masturbatory motions as a flex.
"After no-scoping a n00b, they turned to their opponent and did an el cap power jack (Captain Morgan Power Jack) to celebrate the achievement. It was completely uncalled for. "
(looks down at keyboard and sees esc f1 f2 f3 f4 f5 f6 f7 d8 f9 f10 f11 f12 power `1234567890-= delete tab qwertyuiop\ caps lock asdfghjkl;' return lshift zxcvbnm,./ rshift fn control option command space command option arrows)