Frontin'
American SlangDefinition
Pretending or putting on a false persona to impress others or hide true feelings; bluffing.
Examples
"Stop frontin' and tell me how you really feel."
"He was frontin' like he had VIP hookups, but he couldn't even get us past the line."
"She's always frontin' on social media, acting rich when she's just borrowing outfits for photos."