We used that too. “Prod” was a verb, not a noun, e.g., “OK, on my turn, I’ll prod your Llanowar Elves”.
Also in Magic: A “Speed Bump” is any small creature (which dies) used to block a large creature, especially as a last-ditch prolong-the-game measure, and especially if the large attacking creature had trample, so the block doesn’t even accomplish much.
The Benalish Hero card is always referred to as a “Bananalish Hero”, and costs 1 yellow mana to cast.
A weenie is any creature which is small, but either very cheap to cast, or generated in bulk by some other card. Saprolings, Bananalish Heroes, and goblins are all weenies. We also had a term for slowly killing an opponent by attacking with a single weenie for twenty turns (presumably because nobody managed to get anything else out), but I don’t remember what it was called.
When using a Nightsoil card to generate creatures (you remove two creature cards from anyone’s graveyard to put one weenie into play), the creatures removed from the graveyards are “fertilizer”.
And not exactly terminology, but a house rule: Whenever you have a card that gives you “one mana of any color”, unless you have need of a specific color, you must choose a different color each time. Thus, for instance, if a Bird of Paradise is my only source for red mana, I’m allowed to tap it for red to cast a fireball, but if I’m tapping mountains for the fireball anyway and the Bird of Paradise is just providing one more point of damage, then I have to tap it for an ultraviolet mana, or a plaid mana, or an ocher mana, or the like.
And on a completely different game, in Starcraft, the big gun on the battlecruiser isn’t the Yamato gun, it’s the Yo Momma gun.