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combination of two words: Grim, meaning ugly. And Bimbo, meaning a girl with loose moral character and less than average intelligence.
I drank twenty beers last night and woke up with some horrible grimbo next to me in bed.
grimbo by Lou Stenspayce December 24, 2003
A robot that is either; a)hideous in nature or appearance; or b)not working properly. Malfunctioning.
That ugly silver thing you got to vacuum the floor, is a total grimbot.

An example would be the robot from Lost In Space.
Grimbot by anonymous November 9, 2011
Grimbo is a half naked, albino, starved until the verge of death, and put in a cage until needed for slave work type of being. Grimbo can not be defined as anything near human, as it is the exact opposite. Grimbo has no indentifying features such as a micro-penis, etc. etc. There is one way to identify a grimbo, though. It will make a high or low pitch screeching noise quite often. You can tell what emotion or physical state a Grimbo is in by this chart:
Content: Oroororororor
Mad: oooor OOOROROROROR
Sad: orrrrrr orrrrr orrrrr oooorrrr orr
Fearful: OREROEOEREEIEOEEOOR
Confused: ororr... ororororrorOroroO...
oh no no Grimbo drink too much... GRIMBO DRANKKK TOOOO MUUUUCH
Grimbo by IndianScammer November 12, 2019

Grimbolina 

a word used to describe something bad
She was awful last night, her sister was grimbolina too.
Grimbolina by Jbutters May 30, 2007
An insult, meaning short, ugly, retarded and a various amount of other meanings that you can attach to the word Grimbo.
Rob: God Annette is SEXY
Ali: You'll never get her your such a Grimbo!
Grimbo by Frost Shock February 21, 2010
An individual that realizes, typically in his formative years, that the insecurity he has strugled with his whole life is actually latent homosexuality. This type of homosexuality is often a catalytic, rebelous response to an "overbearing" parent/parent figure; whom trys to re-live their dreams of playing in the NFL through their children. Grimebob's often become infatuated with blumpkins.
When it occured to Magnus that he would never beat Wes Welker in a foot race, he realized he was nothing more than a Grimebob
Grimebob by Thejangles August 21, 2010