An abbreviation that stands for Do Your Fucking Research.

Pronounced die-fer
Dude 1: "Hey, who should I vote for in 2020?"
Dude 2: DYFR, bro

Level 12 Genius: "Is the earth really flat??"
Normal Person: *exasperated sigh* "Really? DYFR!"

Non-believer: "Is Bigfoot real?"
Believer: "Obviously. Haven't you bothered to consider all the evidence? DYFR man."

Engineer 1: "Will these material properties work for my design?"
Engineer 2: "DYFR"
by SaltyTeerz October 18, 2019
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