The Siemens ACS-64 which stands for (Amtrak Cities Sprinter, 64 indicates it makes 6400 KWh) is an electric locomotive that used by Amtrak and septa, they replaced the AEM-7 and the very unreliable HHP-8 locomotives, They are known to have a weird sound when accelerating.
Veronica what’s that light comming from there
Maxima: that’s an Amtrak Siemens ACS-64 keystone comming from Lancaster to NYC with consists of amfleets and the Budd ex-Metroliner cab car 😐
Maxima: that’s an Amtrak Siemens ACS-64 keystone comming from Lancaster to NYC with consists of amfleets and the Budd ex-Metroliner cab car 😐
by EMD F59PHI July 15, 2024

stimming from the group of people who originally used this term to spread awareness of the people who have autism being quite obnoxious and toxic this refers to a human who is "acing" the embodiment of a low functioning autistic individual who cannot function in society or is acting like a person with down-syndrome.
by she' the forsaken April 17, 2021

by Szeahun November 20, 2021

by istheanusreal February 18, 2018

A 14 year old cat hailing from the united kingdom, uses intellectual rhymes , Uses stong lyrics and a piercing voice to deliver his message, Known well for his diss against mc dreded and mc kryptic,
We can't hear ya vocals - Ya on what ace first-did...That clown dreded sounds like a bitch with a dildo inserted! - Ace-B (Royal Flush)
by rislip April 23, 2005

Stands for All Clear and it's used on calculators!
All Clear, Calculator!
©™✓=π are all gone!
Even itself is gone!
All Clear, Calculator!
©™✓=π are all gone!
Even itself is gone!
AC is on calculators.
by @# December 8, 2022
