i bet theres no definition for this

Yes there is, and it's right here you troglodyte.

Something someone types into the search box to try and outsmart the dictionary.

If you'd have used some punctuation in your search, you wouldn't have had to see this. Now suffer, mere mortal.

Nigga 4th wall break, the dictionary has a definition for "i bet theres no definition for this"

i bet theres no definition for this by John Deere 9860 STS combine September 17, 2020

I bet there's no definition for this 

There is, you might've first searched this without punctuation and were disappointed.
Congratulations, you're still an ignorant mere mortal.

Stop trying to outsmart a dictionary.

You: I bet there's no definition for this‐

You were wrong

I bet there's no definition for this by The_peachiest_Peach March 9, 2021