When somebody gets very cross over something which others may consider insignificant. Also a maddiff is never stated by the other person only observers and people around there. A maddiff can also be online when somebody replies to a comment on facebook
etc and gets a bit cross about what was said.
Everyone lAg's (not lag, like I am lagging behind but LahG) at the comment.
Status on facebook
: Thanx for the most epic birthday
party peeps, I love every single one of you! Best Friends
for life :)
Person who replies (close friend): shot for the invite bro'
Another reply: maddiff