FNF x Undertale: Lazybones Home FNF x Undertale: Lazybones 0.0 / 5 ( 0 votes ) Your Rating? Discover FNF x Undertale: Lazybones – Play Free Now on YourGame! FNF x Undertale: Lazybones is a one-song mod for Friday Night Funkin' featuring Sans and Boyfriend in a short rap battle. Check your reflexes in this awesome rab battle game. Play the FNF x Undertale: Lazybones game at RegionGame now and have fun. Categories in which FNF x Undertale: Lazybones is included: Car Dress Up 1 Player