Contraction for that will. Commonly used in everyday speech. Now becoming more popular for online lingo.
A: Is this going to work?
B: Thatl work.
A: Hey there is a big concert this week end!
B: Thatl be sick!
B: Thatl work.
A: Hey there is a big concert this week end!
B: Thatl be sick!
by D. Prosser March 8, 2009