Noun

1. A call for acknowledgement.
2. A program allowing users to send each other instant messages via the internet.

Verb

1. To send an instant message to (someone) using ICQ.
   • 2000 January 14, Greg Miller, "Ethernet Is Changing Dorm Life"^{http://pqasb.pqarchiver.com/latimes/access/47965739.html?dids=47965739:47965739&FMT=ABS&FMTS=ABS:FT}, Los Angeles Times,

     "My friends ICQ me before they call me just to make sure I'm there," said Kurera, a 19-year-old sophomore