The main reasons for vegetarianism are a., to avoid killing or a.i unduly harming animals, particularly a.ii, without consent, b. to avoid environmental damage, or c., to save money.
Because of point 1.a, vegetarians eat animal products, like milk, eggs and honey.
Under point 2., bogeys are clearly okay to eat as an animal product that doesn't kill the animal that produces it. That's probably sufficient for our purposes but lets check against 1. to make sure
No harm comes to you from eating your own bogeys (except indirect social harm if other people find out and want to stop hanging out with you), so that covers 1.a.i. Obviously you consent to eating them, so that covers a.ii, too. There's zero environmental consequences to eating bogeys (b). Eating your own bogeys won't cost any money, so that covers c.
In conclusion, go ahead and eat your bogeys, champ.
The part they didn't consent to was being in pain from overproduction of milk, which is something we imposed on them through selective breeding. If we didn't do that, they'd just go about their merry ways making enough to feed their calves and stop making milk when they've grown enough to feed themselves.