Cause : An action performed that is bound to go wrong because it hasnt been thought out right by the derp
Effect: Extremely awkward situation.
John meets his girlfriend Jen and hugs her.
John: Hi baby! I missed you!
Jen: Babe i missed you too!
John's best friend Sam who is also around hugs them both and wants to say "group hug" but says "Threesome".
Jen: you just killed it .Killed it.
John(Dissappointed): derptastic dude.