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A listening device, regularly used by TV news or talk show moderators, that provides the moderator with a steady stream of audio guidance from the show's producer.

In this usage, the letters IFB refer to "Interference-Free Band", which is the wireless communications band over which such devices operate.
Example:

When responding to a claim made by a white house representative Chris Cuomo said, adjusting his earpiece: “That blew the IFB right out of my head.”
IFB by petelp August 29, 2019
Related Words
stands for Interference-Free Band, a range of radio frequencies used for cuing devices where many other radio signals could interfere with clear communication
George Bush needs an IFB to communicate, especially where he might need to answer intelligent questions. Without his IFB, he'd be cueless.
IFB by Jamesness January 17, 2007
Ifb so I prefer succulence....
Ifb by Bviandy May 22, 2022
Person 1:Its so fucking good keep going
Sigma 2:ifb
Person 1: Bust then hold nothing back
ifb by Igtbmm May 27, 2024

ifb no fonts

This means “I follow back no fonts.” When people write “no fonts,” they mean no fonts in someone’s bio. Together, this sentence means “I follow people back after they follow me as long as they don’t have any fonts in their bio or display name. It is important to not have any fonts on your account because it is difficult for people with screen readers to understands the text. This is most commonly used under gain tweets on stan twitter.
Person A: “retweet to find larrie mutuals!”
Person B: “ifb no fonts” *fancam*
ifb no fonts by fankyoulove October 24, 2020