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
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