Commonly used on instant messaging, an abbreviation for "totally". Most often misread and mistaken for ttyl.
Jack: r u comin ova later??
by smurph July 30, 2006
TTLY means "totally", which is usually used in msn lingo. this is commonly confused with TTYL which means "talk to you later".
no way colin, she's ttly not a biz-natch. she just doen't know anyone.
by BigRigMerhe February 06, 2008