A (generally) male person who's penis is wider than it is lengthy (one who had a choad). This label alludes to the shape of aforementioned genitalia: a cake -- generally having much greater girth than height -- is compared to the penis in question. Often thought of as more the realm of the exceedingly overweight or flabby.
Oneself to a friend: I hear MM is a total cakeboy, no wonder he's so lacking in the ass department
Friend: I've seen him drunk. Guy has a total choad. It's kinda gross.