Not a Road to Go Down With Your Daughters, Mom

Teenage girl #1, about two men arguing violently: Think we should call 911?
Teenage girl #2: Why would we need to call 911?
Teenage girl #1: I dunno, it looks like they're gonna get in to fisticuffs.
Teenage girl #2: Fisticuffs?
(they both laugh)
Teenage girl #2: Fisticuffs! Getting all 1800s on us?
Mom: Fisticuffs! What a funny word! What does “fisticuffs” mean?