national smack ass day Share definition Flag April 12. Smack anyone’s ass and say “it’s national smack ass day” *smacks ass* Joey: “bruh that’s gay” David: “nah man, it’s national smack ass day.” national smack ass day by Fluorescent_Dildo April 11, 2019 0 0 Get merch Get the national smack ass day mug. Buy Now — $32.95 See more merch