>My prefix is a big ol' ass,  
>My infix always comes before;  
>My suffix straight up lies bruv',  
>About the answer that I bore,  
>I told ya who I am already, know what I mean?

**Note:** 
 
*The Accepted answer should both answer the Riley and find all the hidden clues.*

***Hint***
>! Clues are hidden in both the title and the rhyme, once you find the answer everything will make sense, Good Luck.

***Hint 2:***
>!Found after *rainfall* in all *continent*,  
>!Can be found also in *sinful intent*.