Yes the dialogue is custom - Imgflip

Sans/In Battle, Undertale Wiki

My first time choosing that dialogue option, and I was treated to an incredibly wholesome scene : r/Undertale

UNDERTALE] sans dialogue sprites by SooSSpy on DeviantArt

Sans fight quote - GIF - Imgur

Biscia 🐍 #SANSSWEEP on X: sans undertale (from emails) gives you his d # UNDERTALE / X

Undertale Sans fight. Entire dialogue with Flowey. No deaths

CP) Sans as Shane Mod and New Dialogue at Stardew Valley Nexus - Mods and community

Gaster Blaster at Starbound Nexus - Mods and community

Pixilart - Sans Genocide Dialog by 3DaMIR

Undertale Genocide run explained: How to play the game in the most