A marshmallow that is cooked to precise perfection, where the outside shell beautifully golden-brown and the inside is a beautiful, liquid, creamy white. The pleasure of eating such a marshmallow is matched by very few things. The perfect orgasmallow is best toasted over the embers of a campfire, for marshmallows often catch fire over the open flame.
Sally: I'm having so much fun at this campfire! Would you toast me a marshmallow?
Tommy: Certainly! I'm an expert at toasting them to orgasmallow perfection!
A very big word combining a few other words that simply adds up to meaning very fucking awesome. Usually used to describe food.
(The words are Orgasmic + delicious + tasty + awesome)
Kid: *eating pizza* THIS SHIT IS ORGASMALICITASTISOME!
Mom: *confusedlook*