NASCAR superstar Denny Hamlin is begging for forgiveness after posting a racist video clip directed at fellow driver Kyle Larson ... saying it was "offensive" and a "poor choice of memes."
Hamlin was trying to make light of a crash Larson caused during the Geico 500 on Sunday ... going to Twitter to share a "Family Guy" clip of an Asian woman getting in a car wreck and superimposing the Hendricks driver's name over it.
Larson -- whose mother is Japanese American -- did not respond to the tweet, but Hamlin was quickly called out on social media .