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.

Plants vs Zombies - 1 Threepeater vs Gargantuar vs Dr. Zomboss

Threepeater Gatling Pea vs Dr.Zomboss - Plants vs Zombies

threepeater fan art by PlantsvsZombies-GW on DeviantArt

Threepeater, Plants vs. Zombies Wiki

Threepeater Coloring Page for Kids - Free Plants vs. Zombies

Plants vs Zombies Hack - Threepeater Wall-nut vs 99999 Zombies

20cm Plants VS Zombies 2 Peashooter Snow Pea Repeater

Threepeater, The Plants VS Zombies 2: Its about time Wiki

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