In Saint Lucia, it's used as an adverb; synonymous to boldly and without fear. It is used to imply that someone will either say the brutal truth or their honest opinion
1. Bro, I go say it boldface. Di girl not missing, she at her mun house. (Bro, I'll say it boldly. The girl isn't missing, she's at her man's house)
Guy: Not going to liety is a pretty good looking guy.
Hot girls (at once): that's a goddamn boldface!
Guy: Yea that's true, not to mention sugana999 beat him 1v1.