the biggest of the oofs, a MEGA OOF

Got the covid-19 vaccine

the biggest of the oOfs, a mega oOf

when your oof is so big that constantly repeating the word "oof" won't explain how big of an oof your problem is

if your friend have Aids but you have to say something

An oof that is significantly larger than a standard oof. Mega oof crosses the line to where it is actually insulting whereas an ordinary oof only states that the used does not care about the tragic event that they have just found out about.