WAH BAM! 

A cult saying first made popular by MMORPG players in anticipation of the game Mortal Online, it was first said by Kudo Sinoda during the Xbox 360 project Natal demonstration for E3 2009.
During the demonstration the motion sensors responded horribly sending the on screen avatar into some kind of epileptic fit.

The term was first made popular in Mortal Online IRC channels, where Sampzky and other Mortal Online Beta applicants watched the live E3 2009 press conference together in the IRC channel.
Today, the term 'WAH BAM!' is used to express total failure; failure which is usually executed in a retarded or spasticated fashion.

The full quote is as follows:

Kudo: "You ever wonder what the bottom of an avatar's shoe looks like? WAH BAM!"

*Onscreen avatar cripples and flails horribly*

Kudo: "There it is...?"

Player 1: Hey, lads! Watch me solo this boss mob!
....
Player 1: I forgot my armour and weapons and FarmerJoe killed me :(
....
Player 2: WAH BAM!!!!

WAH BAM! by Sampzky June 2, 2009

Wah Bam 

Something to yell when flipping it off to someone.

When i saw him round the corner i looked at him, and flipped him while saying, WAH BAM!

Wah Bam by PaineXNoctis December 4, 2014

BAM CHICKA WAH WAH 

The Term BAM CHICKA WAH WAH was 1st used in Axe commercials when girls would go under a spell that would make them instantly wanting of the person wearing the AXE.

It has further more evolved into a term for anything that is sexual.

Im going to take Laura out to the beach and lay her down... you know... BAM CHICKA WAH WAH!

BAM CHICKA WAH WAH by Sean Daniel Murphy November 7, 2007

WahBAM

To further iiterate a point

Your Face is Etc, WAHBAM!

WahBAM by Ferginator4k August 16, 2010

Wahbam

to be so amazing and great. To be above all teams, groups, and people.

That chick Wahbam at basketball.

Wahbam by taylor Bizzell April 13, 2010