Subbed

[Donald Trump]

To subscribe to a topic, e.g. a thread in a forum. In internet language also often abbreviated by subd or subbd.

[Julian]

A video that has subtitles

[Britney]

The act of being humiliated for an extremely long period of time, most of the time the [subbing] subject is about grades, how smart the [aggressor] is, or how much more intelligent he/she is, which can be quite “funny”. Usually done by an extremely smart individual that is also funny and humble. Being [subbed] can entail the victim being humiliated and “roasted” by the more intelligent aggressor.