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IRST is the abbreviation for "Infrared Search and Track". This system is found on many aircraft like the F-4C, Su-33, F-14D etc. It is the shape of a dome and is transparent/translucent with a small infrared camera connected to a few hinges so it can track and follow targets.
The IRST is tracking an SA-6 SAM site currently
IRST by Fox00One July 24, 2022
Related Words

Indie Rock Standard Time (IRST)

The official time given for when a band will perform, even though everyone knows they will actually go on at least 45 minutes late.
Person One: What the hell? Weren't Black Lips supposed to go on at 10:00? That was nearly an hour ago!!??!

Person Two: Psh, dude, chillout. They were supposed to go on at 10:00 Indie Rock Standard Time (IRST). Look, they're about to go on now. Right on time.
the baddest bitch to ever live , she’s wild and is always down to go anywhere. she doesn’t take shit from anybody and she’s the real life of the party.
irsti is always there for friends even when they’re doing dumb shit. she yolos everything she does even when know she’s going to get caught.
irsti by irsti April 23, 2020
someone who is desperate for sex, to the point of it being obvious.
a person who is dying to get laid.
male-"omg, you see that girl's ass? damn!"
friend-"look at you, you mad irsty right now"
male-"i know, i haven't gotten laid in months"
irsty by scottie k January 6, 2008
Indecisive whore, who has to have the last word in any argument
She is so irste
Irste by Hahahahaah45 June 4, 2020
UwU irstine is cool
irstin by UwU UvU May 17, 2021