Kaboomer
A Karen who is also a boomer, they blow their top and scream like a banshee, making them a KABOOMer.
"I can't believe you didn't give me a coupon!" she yelled, then threw a coffee cup at the barista.
She exploded in the middle of the grocery store, knocking over a whole aisle of cereal.
She screamed so loud, the dog next door had a heart attack.