A system used to kill bacteria and viruses. Also fungi, and parasites.

Example of Imunne doing its job.

Macrophage: Yo! There is a bacteria over here.
Neutrophils: Ok man, gonna eat this dude, and we are done!

Another example.

Killer T-Cells: Yo! This infected cell is going to die.
inset cell dying

Last example.

B-Cells: Yo this bacteria is too dangerous, gonna make some Antibodies.
insert bacteria being disabled and Macrophages and Neutrophils eating them
1: how's your immune system doing?
2: ok, they are fighting the Flu.
by sussiboka December 31, 2022
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Refers to the human race's unwritten legal code ("The System") that exempts dead people from being responsible/punishable for unwise or offensive action.
Thanks to the rules of the immune system, dead people cannot be blamed or caused to feel regret for prejudiced remarks, as is shown in the following infamous comic conversation from television.
Achmad the Dead Terrorist: I would not kill the Jews... I would just toss a penny between them, and watch them fight to the death over it! Or in the case of a couple Catholic priests, I would toss in a small boy!
Jeff Dunham: Stop it, Achmad! You can't be telling racist jokes on my show! It offends people!
Achmad the Dead Terrorist: Well, I'm already dead, so what do I care?
{{audience guffaws}}
Achmad the Dead Terrorist: SILENCE!!! I KEEL you!
by QuacksO November 23, 2013
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Another way of saying drunk and/or hungover. Owing to alcohols ability to suppress the immune system and the fact that it is usually drunk in largest quantities on the weekend.
Ugh yeah I'm not going to be able to come in to work today, I have a weekend immune system
by lusciouslucas February 11, 2019
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