Regret Nut 

To imediately have a feeling of regret and shame after busting a nut'

After i had sex with my step sister, i had the worst case of regret nut....

Regret Nut by cheem1981 May 3, 2012

After nut regret 

When you cum to really questionable porn that was hot while you were watching it, but now you see how disgusting it was

Man: what’s wrong with you
Man 2: i watched this video a girl eating cream off another girls butthole and now I have after nut regret

After nut regret by Heartbestill34 November 11, 2019

Post-nut regret 

When you busted a nut yet you regret doing something I,e getting caught after ejaculating.

I had post-nut regret because my mom found me.

Post-nut regret by HahaNut27 April 30, 2019