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1.
n. The period of time that happens occasionally where everything feels "off", or unfamiliar. Your behaviour briefly changes without explanation temporarily, possibly to extreme depression, boredom, somewhat eccentric, or lame. You essentially start to act weird.

Derived from the word period as it is during this time that a woman's behavior or feeling temporarily changes. However, a weriod can happen with both males and females.
Bob: Hey Timmy, why are you so quiet today?
Timmy: Sorry, dude. I'm just on my weriod. I'll get over it by tomorrow.

I'm on my weriod so I can't come to the party today. :(

Get down from that pole! What's with you today? Are you on your weriod?
by Putter, Harry September 10, 2011
 
2.
Slang term used to describe something that is weird, Weriod!
Gosh Thomas R. Chesnes, that really is weriod!
by Sarah Awkaird February 13, 2008