A&S - All And Sundry 
a.k.a. - also known as 
A/S/L - Age, Sex and Location 
A/S/L - Age/Sex/Location 
A/S/L/P - Age/Sex/Location/Picture 
A3 - Anyplace, Anywhere, Anytime 
AAAAA - American Association Against A… 
AAF - As A Friend 
AAK - Asleep At Keyboard 
AAMOF - As A Matter Of Fact 
AAMOI - As A Matter Of Interest 
AAR - At Any Rate 
AAR8 - At Any Rate 
AAS - Alive And Smiling 
AATK - Always At The Keyboard 
AAYF - As Always, Your Friend 
ab - about 
AB - Ass Backwards 
ABITHIWTITB - A Bird In The Hand Is Wo… 
ABT - About 
ABT2 - About To 
ACD - Alt Control Delete 
ACE - access control entry 
ACK - acknowledgement 
ACORN - A Completely Obsessive Really… 
ADAD - Another Day Another Dollar 
ADBB - All Done Bye Bye 
ADIH - Another Day In Hell 
ADIP - Another Day in Paradise 
ADN - Advanced Digital Network