Overwatch

Half-Life 2's AI that commands the Civil Protection and Overwatch Transhuman Arm.

It has a female sounding voice and has no physical form.

It gives warnings and orders to soldiers and officers. It receives orders from the Citadel and puts them in effect.
Overwatch Soldiers and Civil Protection Officers can request reinforcement and other things depending on their situation.

"NOVA PROSPEKT STABILIZATION FORCE DIRECTIVE TWO. ENGAGE RESERVE. CONTAIN EXOGEN INCURSION."
"Overwatch confirm double boomers dispatched inbound, ghost drop inbound, prepare for Skyshield heavy suppresion and wrap up."

Shat

A consequence from eating taco bell.
or
Disposed of shit; Defecated.

1: I had some really bad taco bell last night.
2: Really?
1: Yes. I shat so hard my house almost collapsed.

everything can kill you

Everything can kill you, Even paper! EVEN AIR! doesn't matter what it is
If used correctly, You get killed.

Alex: Did you know that everything can kill you? Just think for a moment on how many stuff can kill you.
Max: Sheeeeeesh man, I know right!