pop(n) - pop music aka popular music; what old people call softdrinks; an album released in the spring of 1997 by U2. The album had such hits as "mofo" and "staring at the sun" and featured other talents such as trip hop artis Howie B. It spawned the awe-inspiring POP Mart tour as well. PoP also stands for Point of Presence referring to a local Dial in number for an ISP. POP also stands for Post Office Protocal and is a method of retrieving mail off a remote host.See Imap