Boolean

Boolean is a convention in computer science to express the logic values of truth as a binary code: "true" is represented as 1 and "false" is represented as 0.

Sheldon uses Boolean when Leonard tries to impress Penny with little inaccuracies about Sheldon's contribution to a joint work (0109):

Sheldon: Libido: 1, truth:0.

"Translated" this could be interpreted as "what Leonard says represents his libido and not the truth".