haancostfu
Haancostfu is when someone finally snaps and tells you to shut your piehole after you've been yapping nonstop.
My mom said 'Haancostfu' when I talked for 20 minutes about my cat's hairball problems.
My friend texted me 'Haancostfu' after I explained my toaster's feelings 12 times.
At lunch, my teacher yelled 'Haancostfu' when I asked why the sky was blue for the 7th time.