Unofficial medical acronym for a person who is about to die. The acronym stands for "Circling The Drain". Using this acronym on a medical report, under certain circumstances, can get one fired instantaneously. (There is an official use for "CTD": it really stands for "Carpal Tunnel Decompression".)

Chuckle to death. It's the new alternative to LOL or laughing out loud. ROF may be added on to form ROFCTD.

Computer Transmitted Disease

Acronym for Cummins Turbo Diesel

Crash Test Dummy
An extremely disgusting person, who looks like Buster from Myth Busters after an unbelievably ugly test

Camera Transmitted Disease. Caused by web-cam whore's that have web cam sex a lot.

Cellularly Transmitted Disease, like an STD but for cellphones. CTD's can only be obtained by receiving a dirty pic.