Is there a single word slang or otherwise that can describe
A person who continually overreaches or overestimates their own abilities.
and example usage
"Bob's such a
word: He always injures himself."
The closest non-slang term I could find was narcissism, however, this isn't really appropriate. Rather, an expected characteristic for someone with this trait.
In sporting slang, there are several terms:
- Kook (generic extreme sports, slightly abused in this context)
- Jerry (in snowsports e.g. "JerryOfTheDay")
- Tryhard (strictly two words in my opinion)