Boomerang comment

A comment or pun that you don't understand or hear properly at the time, but you get it soon after.
The realisation hits you later what the comment/pun means.

*Filthy comment you missed*

A couple of seconds later...

"Aw man, ya dirty bastard"
"Bit of a boomerang comment for you there?"
"Yes, the realisation of your filth, hit me ferociously."