False Bravado 

Portraying yourself as much more confident then you are as a defense mechanism.

She knows she's wack, but her false bravado causes her to strut around claiming she's a dime.

False Bravado by The Most Savvy December 26, 2011

keyboard bravado

Engaging confident or brave talk or behavior that is intended to impress other people from the safety of being behind a keyboard instead of in person, usually accompanied by blustering swaggering conduct and a pretense of bravery. Can also describe the quality or state of being foolhardy on social media in a way that one wouldn't otherwise act in other circumstances.

What would have been an otherwise civil debate escalated into an online meltdown due to much keyboard bravado and fragile egos.

keyboard bravado by jasonspsyche April 13, 2015

Breakup Bravado

A state of mind one is in after a breakup. Large life changing choices are made, though rarely followed up on. Upon reflection, one questions what the hell one was thinking.

Jill: Weren't you going to join the army after Alice left you?

Jack: I was, but it was just breakup bravado.

Breakup Bravado by Matthew A Connor January 22, 2014

onscreen bravado 

A person using a computer who acts big and pretends to be braver than he/she is in real life.

Why are you talking like that to me, i know it's only onscreen bravado.

onscreen bravado by Scratchibum September 6, 2013

macho bravado 

a show of bravery often false with the actual aim of gaining attention

john`s macho bravado attracted the girls to him

macho bravado by Easlejays February 21, 2018

Immunity Bravado 

The egotistical and potentially mistaken belief that one is so healthy that they a) would have no issues with the Covid infection and take very little or no precautions not to get it or b) believe they probably have had a case already and it was mild since they are so healthy and are now immune and may seek an antibody test to confirm or c) they announce their wish to get infected just to get it over with and again are overconfident with their current state of health.

Vince doesn’t wear a mask when shopping at Walmart because he has immunity bravado.

Immunity Bravado by Mike S M June 17, 2020

Online bravado 

Displaying courage online due to anonymity or because the odds of negative consequences are lower.

Susan: I was chatting with this guy I just met online and we were discussing all kinds of things that I would never talk about in person with someone I barely know. I think I may be in love

Jenny: Oh Susan, wait until you actually meet him, that was probably just online bravado.

Online bravado by abramj123 August 15, 2010