Prone to being touchy-feely. Very obvious (often public) display of affection.
"So hows the new girlfriend??" "Not sure...shes kinda demonstrative"
by Angel** March 5, 2007
1.To prove or show something by giving any evidence.
2.To make actions,to tell that you've a particular quality.
3.To make actions to show that how to do something.
4.To take part in a protest or an event that is supporting something.
1.she showed his blooded shirt just to demonstrate that he has been killed!!!!
2.He was trynna show that he could dance good by dancing in front of me in the club.
3.You ain't doing it rightly,let me demonstrate or let me give a demo.
4.We're gonna demonstrate in tomorow's protest!!!!
by Hafi February 8, 2010
A person performing a demonstration, such as to explain science or technology
A person demonstrating a product for sale live or in an infomercial
An attendee at a political rally
An academic rank
A vehicle adapted to emergency service specification, and issued to locations for use as a prospective emergency vehicle if adopted to that workforce either police, ambulance or fire.
A fountain pen with a transparent body originally used so dealers could show customers how they worked. See Demonstrator pen
Hello I will be the demonstrator for the day.
by Α January 26, 2022
as found in dictionarydb dot com slash demonstrous
Due to the awesomeness of this word, there are several definitions layered within these three syllables.
a. To react in melodramatic fashion to a merely normal comment.
b. To exhibit demonistic qualities.
c. All of the above.

I would modify this to read:

Due to the awesomeness of this word, there are several definitions layered within these three syllables.
a. To react in melodramatic fashion to a merely normal comment, incident, or impetus; to be overly demonstrative, akin to tantrum.
b. To exhibit demonistic qualities.
c. All of the above.
d. To show or cause something to be un-monstrous.
as found in location indicated in definition
Mich*lle Kence once again reacted in typical demonstrous fashion over a standard set of news at her latest department meeting, while Vitaliy Djamgarov looked on in bamboozled fashion.

I would modify this to read:
she once again reacted in a typically demonstrous fashion over some news at her latest department meeting.

I would add: 'he was so demonstrous that they had to call security', and 'his intervention rendered the threat ineffective; it was suddenly demonstrous'
by wordcarver October 21, 2012
the opposite of monstrate, which is the ability to turn into an inhuman creature (i.e. count chocula or joan rivers)
look over there, that old man is demonstrating himself in front of those teenage girls!
by Paul July 27, 2004
Noun: The flying 4th class in the popular team-based shooter TF2.
how to fly as demonstration man?
by sn3k4_34t3r July 2, 2018
female masturbation. from chien & wexler's (1990) study on the acquisition of principles A & B, wherein they asked children, "is mama bear touching herself?"
mama bear hasn't been getting any recently, so she's resorted to demonstrating principle A on a regular basis.
by MBILF February 7, 2010