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1.
A ploob is a power leveled noob. They tend to have high level characters and do not know how to play them.
For example, a high level character who has done nothing but power level to get there would be considered a ploob.
by Johnhead August 15, 2007
 
2.
An obese person's arm. Can be used affectionately or derisively.
That 500-lb. lady hat the most spherical ploobs I've seen on any overweight person. All that fat up there is going to kill that lady's spine for sure!
by pentozali November 23, 2005
 
3.
A substance created by a mixture of human faeces and sexual lubricant.
"I need a bottle of ploob, young Jonny loves it!"

"Will you please ploob up the dildo before sticking in my ass?"
by Milney. July 10, 2008
 
4.
An affectionate term used towards a significant other.
"You are my lil' ploob, you know that?"...
by Loving Ploob vc February 01, 2007
 
5.
Ploob originates in MI. Its definition is that of Faye. Ploob occurs when two people hate each other so much that they fall in love. Also a dish at gourmet restaurants. Its most common form is as a side dish.
"May I have a side of Ploob with that?"
"I will ploob with you."
by Kelly Travolta February 26, 2005