In the course of a competitive situation putting down your opponent verbally or saying how good you think you are. Oftenly involving talk of moms or sisters.

The term "trash talk" originated with online gamers (especially in Fantasy Football) who would ruthlessly rip on each other for their gaming skills. The point of the term trash talk was to whitewash what can be otherwise abusive language that should not be confused with or taken as personal attacks but merely in the interest of friendly hate. Yet, the term trash talk can be used more broadly to include any type of shallow talking that has little to no substantive value or importance whether that talk is negative or positive.

1) Verbal abuse used during competition to upset the opposition.

2) To verbally abuse the opponent during competition.

A very horrible sounding hardcore punk band that people listen to only because OFWGKTA (Odd Future) supports their music.

It's when you discuss trash.

The further belittling of an old, crippled, senile, arthritic, putrid, and futile podcast producer.

When a person uses his opinion against another object or person to make them feel bad but in reality is just making them realize that they need to listen .