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1.
a fire deptartment term for a shift, they work every 3rd day. smug little fuckers who think they are better than the other two shifts. They will use any excuse to inflate their heads cause they think the KOOL-AID they drink together makes them super firefighter. They tell how much training they do, but it involves coffee and the price is right.
I'd rather be a cop than an A-shifter.

God made A-shift to give the other 2 shifts a day off

B-shifter to an A-shifter- "so did you guys clean the truck?"

A-shifter- "NO! we where too busy drinking KOOL-AID! and we ran 2 calls so we where way to busy to take time to clean the truck!"
by C-Shift October 08, 2009
 
2.
a person who says something one day then changes their opinion to the opposite the next on a continuous basis
Trent: Bro, Melvin told me to fuck off and get out of his life last week, now he's saying i love you and acting like a mate

Abanoub: Yeah what a freak, he's done that like 20 times to me, such a shift.
by the original t-bag October 30, 2008
 
3.
One of the fire departments 3 shifts. Training involves checking cracks in their eye lids and making sure the dexterity of the couches doesn't diminish. These ass clowns arnt worried about how clean the engine is because its just a work truck and they only have time to run calls because they are so busy with "training" otherwise. If you like being a worthless piece of shit this is the shift for you!
A-shifter: "Hey guys, I know i just got food from lunch all over the floor but i have to make sure the couch is stable enough for my fat ass so ill be over there"

B-shifter to A-shifter: "I took a shit this morning, looked down and there you were floating in the toilet. I said what the hell are you doin here so early this morning? let me help you out, flush!
by Jack Sean March 12, 2012