What Does A.m./p.m. Stand For?

Actually its latin...
AM means - Ante Meridian, before noon.
PM means - Post Meridian, after noon.

A.M. Stands for ante meridiem and p.m. Stands for post meridiem. You're wrong you idiot. I feel bad for your son, he's probably smarter than you!

My guess was am: After midnight and pm: Past midday...I guess I was waaaay off

Anta meridian and post meridian

A.M. = ante meridiem

P.M. = post meridiem

They're from the Latin:

Ante = before

post = after

A.M. Stands for 'ante meridiem '(a.m., from Latin, literally "before the middle day",
idiomatically "approaching midday") and P.M. Stands for 'post meridiem'.

It means  Ante meridian and post meridian

A.m stands for a morning and pm means past morning

AM means - Ante Meridian,
PM means - Post Meridian,

AM STANDS FOR Ante Meridien&PM STANDS FOR Prime Meridiem