Cockgoggles is also the more preferred word to use in place of cockgoggle as an insult, much in the same way you would use the words goggles or pants as opposed to goggle or pant, which should only be used in cases such as referring to a pant leg or a goggle lens.
Person 2: Cockgoggles! That's going to ruin the game!
Person 1: Naw man, I'm just messing with you.
Person 2: Man, you can be such a cockgoggles sometimes.