The name for a type of mental illness. When you have that special kind of OCD where, when texting, you spot a typo after you hit send and MUST send a correction immediately after, usually included with an asterisk (*)
Man, you don't have to always correct your spelling to me in our texts, you know.
The active process of making typos. Usually in Instant Messages or Texting where the typist hits enter/send before seeing the typo.
Can be used as either:
A noun: Typoing is quite common.
OR
A verb: We were typoing yesterday.