Any semi-solid or liquid substance; especially one that is sticky, gummy or slippery, unpleasant, and of vague or unknown composition, such as slime or semen.
"The toddler tried to say "goodbye," but it came out as a silly goo sound."
An example of baby talk.
In plain English: Goo is silly, made-up language sometimes used when talking to babies.
"The toddler pointed at his mashed carrots and said goo."
Usage: Use this word for messy substances like glue, slime, or honey rather than formal terms like "paste" or "gel." It often carries a negative connotation when describing sticky messes that are difficult to clean up.
To apply goo to something.
"The toddler started to goo when she saw her favorite toy."
To produce baby talk.
In plain English: To goo is to speak in an overly cute or childish way, often using simplified language.
"She started to goo and gaa when she saw the newborn puppy."
A surname.
"The local legend says that Goo was once a famous folk singer in the valley."
The word goo originated as an onomatopoeia mimicking the sounds babies make while babbling. It entered English through this playful imitation rather than being borrowed from another language with a specific original meaning.