When someone gets so mad that it has
the potential to ruin their whole day. Noticeable when someone lets their anger
leak out, usually described in forms of yelling or
raising their voice in defense.
When I told josh I screwed his girlfriend he
maxed out.
"Dude are you serious? I can't believe you, out of all people, got me to
max out."
"What?!?! I got
an F on my Spanish exam? My parents are going to max out!!"