A person who is failing at typing. They are regularly all over the place and it appears they are in fact having a seizure while typing.
Herty man hosw ti going>?
(Hey man, hows it gowg?
Person 1: Hey dude what were you on about last night, calling gen busty?
person 2: OH NO, i meant gen is busy!
1: Classic case of keyboard spastic right there.