'for sure' definitions:

Definition of 'for sure'

(from WordNet)
adverb
Definitely or positively (`sure' is sometimes used informally for `surely'); "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; "they sure smell good"; "sure he'll come" [syn: surely, certainly, sure, for sure, for certain, sure enough, sure as shooting]
adjective
Not open to doubt; "she wanted to go; that was for sure"