Halloween is an annual holiday/party day that takes place in October 31st. Half-A-Ween/Half-O-Ween is defined as the day that is between, in the middle, of the previous and upcoming Halloween day. The actual day is May 1st. However, since it is not an official holiday, people celebrate it by dressing up just like Halloween roughly in May or June hence the name Half-A-Ween/Half-O-Ween.

However, its just an excuse for people to celebrate and dress up. It really has nothing to do with Paganism, Christianity or any cultural references. Its a holiday created by young adults that was born in the 80s and needed something to reminiscence their childhood.
Lets Half-O-Ween it!

Lets have a Half-A-Ween party!

Our Half-O-Ween was awesome, I totally forgot what happened!

After our half-a-ween party last night I found a random chick in my bed, do you know who she is?
by tyfung May 14, 2011
Get the Half-A-Ween mug.