Subilient

Doing something half-assed without knowing it while thinking it's completely done.

Tommy subiliently finished his public speech script. And basically got screwed when he realised it was Subilient.

James: Guys, Im finally done watching How I met your Mother!

Barnos: Oh nice. So you know that Tracy is the wife?

James:....There's a second season?

Barnos: Oh James you are so Subilient