“Tuber” has a couple of main meanings in English, depending on context.

Main dictionary meaning

In biology and everyday usage, tuber is:

  • A thick, usually underground part of a plant stem that stores food and can grow into a new plant, like a potato or yam.
  • This storage organ is full of starch and has “eyes” or buds that can sprout into new shoots.

So when someone says “a tuber crop,” they usually mean plants grown for these underground storage stems, such as potatoes.

Other dictionary uses

Some dictionaries also give:

  • A fleshy root or rhizome that resembles a tuber.
  • A person who rides an inner tube for fun (for example, on snow or a river), i.e., “a tuber went down the hill.”

These extra meanings are less common than the plant one, but they are still considered standard English.

Slang and internet usage

Online and in forums, “tuber” can show up as:

  • A playful slang shortening of “YouTuber” or content creator, especially in memes and chats.
  • In some gaming and streaming circles, someone hunting for a “crazy” or highlight-worthy game to upload to YouTube (for example, in Teamfight Tactics discussions).

In casual chat, sentences like “That tuber’s new video is wild” usually mean “That YouTuber’s new video is wild,” often with a joking “potato” vibe layered on top.

TL;DR:
Most of the time, “tuber” means an underground, starchy plant stem like a potato; in internet slang, it can also jokingly mean a YouTuber or highlight- hunting streamer.

Information gathered from public forums or data available on the internet and portrayed here.