Use this tag on images that show a character comparing their penis to a Monster energy drink can.
Originating from an Astolfo cosplayer doing this, and soon popularized by a drawing of it, it became popular in meme humor as an inside joke, particularly among femboy and trap memes. Just the image of a monster energy can and narrowed eyes is enough to conjure up the reference in one’s head.
For reference, a 16 oz can of Monster energy is 6.9 inches (or 17.5 cm) tall.