For those that don’t know, vibrating panties are a wearable sex toy that can be controlled via remote.
Hamilton, the internet prankster responsible for HammyTV, buys a set of the special underwear for his hot girlfriend and asks her to try them on.
She conveniently “forgets” she’s wearing them before they go visit Hamilton’s mother for dinner.
What happens next is most likely completely fake, probably like everything else that happens in their bedroom.