AIBU - what does it stand for?

[lovemeorleaveme]

I'm newish and keep seeing AIBU everywhere. I'm feeling very thick here and it's prob really obvious and going to feel like I right idiot but what does it mean?

Am I being unreasonable!!

Am I Being Unreasonable

A ha!! Mystery solved thanks :-)

At a certain time of year, it once meant "am I being unseasonable".

I was bemused by this when new to MN; in particular when searching for threads, all the ones which began with "to", such as "to say no?" "to complain about this teacher?" etc. I didn't realised that "AIBU" came first.