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1.An irish kid who likes to jump out windows and a proud bearer of an irish name.

2.someone gifted in a hobby such as guitar,and video games.

3.someone who could beat the fuck out of his own kind such as a mckinney or a finney.though a cunningham could kick his ass.
1."did you see that o'day jump out that window?holy shit i did!!"

2."that o'day kicked my ass in halo while playing an awesome solo."

3."mckinney and finney tried acting all tough but o'day kicked there asses and then cunningham came out of nowhere and kicked o'day's ass over a pawffle."
O'Day by Crimson Kaos June 30, 2009
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1.) To fuck something up, or likewise fail miserably though laziness
2.) To be a slapnut and/or asshat
"Don't pull an O'day and drop out of college"
O'day by JFAPPM June 10, 2006
To mix so much alcohol with a drink, that you can barely taste the drink you are mixing it with.
mmmmmm 151 with a hint of gatorade.... yep I totally o'dayed that shit
o'day by sam der November 9, 2010
On O'Day go up to some random person who's name starts with a O and give them a hug
O'Day is to celebrate people who's name starts with a O
O'Day by Uzzie November 3, 2019
An exclamation before a statement to add emphasis.
Man-O-Day! It's hot out here today!
Man-O-Day! Richard is being a jerk.
Man-O-Day by AE76 September 27, 2019

abort-o-day 

a day when you get up late, waste time, and realise it's 3:30 and you're still in your PJs and it's too late to go out for "daytime" activities.
Today was an abort-o-day - exactly like yesterday, in fact.
abort-o-day by richard_geefe January 8, 2005

evap-o-day 

When it's 4:30 pm and you suddenly realize your to do list is no shorter than it was when you started. It might, in fact, be longer.
4:15 already? Holy cow, but this has been an evap-o-day.
evap-o-day by LoriLynn June 6, 2011