blunderfest 

A very poorly executed festive or celebratory event, especially during the holiday season, involving team participation that results in chaos and confusion.

Thanks to the complete lack of planning and coordination plus the unexpected blizzard, the office party was a blunderfest of epic proportions.

blunderfest by Snoopy4321 February 19, 2017

Blunderbust

When you're supposed to cum (bust) on a girl's face in a porno but you miss her face or can't produce any cum at all.

Director: Ok Tyrone, now imam need you to bust oh her face.
Tyrone: alright boss- (misses her face)

Director: God fucking damn it Tyrone not another blunderbust!

Blunderbust by RE4LITY December 14, 2016

Blunderstanding 

to gain new insight through serendipitous means

Alfred Nobel gained a new blunderstanding of explosives when he accidentally mixed collodium (gun cotton) with nitroglycerin to create dynamite. President Bush now blunderstands what it might take to bring democracy to a Middle Eastern country by trying to rid Iraq of WMD’s.

Blunderstanding by D. MacFarlane November 8, 2007

Blunderstand 

to gain new insight through a serendipitous mistake

Alfred Nobel gained a new blunderstanding of explosives when he accidentally mixed collodium (gun cotton) with nitroglycerin to create dynamite. President Bush now blunderstands what it might take to bring democracy to a Middle Eastern country by trying to rid Iraq of WMD’s.

Blunderstand by D. MacFarlane January 5, 2009

Blundermentalist

A man whose sole purpose in life is to blunder. A fundamentalist of the art of blundering. A man of questionable state of mind.

Tom:Crikey, that man likes to Blunder!
Harry:Yeah he's a true Blundermentalist.

Blundermentalist by "killahbee33" January 8, 2009

Blunderstatement 

A dangerously understated and inaccurate description of a situation.

"The Boris Johnson press conference was largely blunderstatement."

Blunderstatement by justified_jamms February 21, 2022

blunderstorm 

a day where everything you do turns into a mistake and all of your troubles come raining down on you all at once. a day such as this may give a person suicidal thoughts, but always passes by the next day.

hey man, how's your day?
dude, its a total blunderstorm.

blunderstorm by periwinkle1996 October 9, 2010