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To drink so hard on a Friday, that you don't recover till about noon... on the following Monday.

or

To be so hungover that you miss work the next day.

or

To raid your $50 a bottle mini-bar.

or

To jump in the pool with your phone in your pocket.

or

To have a great time.
"This project is such a mess, I feel like pulling a whelan and not even showing up tomorrow."

"I thought I had lost my phone, but it turns out I just pulled a whelan with it last night."

"I pulled a whelan with my mini-bar and didn't even make it out of bed for days."

"Work is killing me, tonight I need to go out to whelan hour."

"I drank so much, I thought I had whelan poisoning."

"Why didn't Mike show up for work? He's pulling a whelan."

"I can't wait for this weekend, we're going to take a taxi so we can all get whelan at the bar."
whelan by MikeyW8 June 18, 2008
an innovator, a pioneer, an inventor, someone that creates something completely new.
Whelan by apostropherex October 25, 2010
"hey liam, keep my chair, im going to the WHELAN"
Whelan by retlas July 20, 2009
some one who whities after 2 hits of weed
whelan is a stupid jeeeeewwwwwwwww
whelan by egtfsw January 6, 2008
To put forward a false narrative in order to shift blame from a famous current friend to a relatively anonymous, childhood friend or classmate. A truly proper "Whelan" is filled with enough detail that any 12-year old able to use a search engine can debunk the "Whelan" in no more than ten minutes.
You knew Kavanaugh's nomination was done the minute his side tried to pull a "Whelan," resulting in another avalanche of bad press.
Whelan by GustavNYC September 24, 2018
(Adj) Having or lacking a fully sized penis
Chris Whelan has a Whelan penis.
Whelan by Zahmbie202 November 19, 2010