3peater - What is 3peater short for in Plants vs. Zombies games?

3peater is short for "Threepeater." See an example of how people use it.
In Plants vs. Zombies games, 3peater is short for threepeater, which is a plant that shoots peas in the lanes around it (their lane and the one above and below it). Plants vs. Zombies (often abbreviated as PvZ) is a series of tower defense games where plant-wielding players defend against a horde of invading zombies. The games are available for most gaming platforms, including mobile devices.

Snow Threepeater, Plants vs. Zombies Plush Wiki

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PvZ 2, Level UP Threepeater at level 17

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Plants Vs Zombies Mod ALL THREEPEATER (PVZ MOD)

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This cracked out threepeater : r/PvZHeroes

Threepeater Pvz2,Threepeater Pvz1 Vs Torchwood in Plants vs

Threepeater (Plants vs. Zombies 2), Plants vs. Zombies Wiki

Threepeater (Plants vs. Zombies), Plants vs. Zombies Wiki