Best definition
Acronym: You damn right!A reply when someone makes a statement/question you totally agree with
Person 1: Are you going to the football game tonight?

Person 2: YDR!
YDR: define #2
Acronym: You’re dead right.

A reply when someone makes a statement you totally agree with. Spoken as “You’re Dyead Wroight”.

Occasionally used ironically, when the person in question is in fact not dead right.

Example 1:

Person 1: This maths homework is a bloody pain the the arse!

Person 2: YDR!

Example 2 (Ironic):

Mr. K: What’s 2 + 2?

Student: 5?

Mr. K: You’re Dyead Wroight!