To unwillingly do something,even though it is the right thing. Deriving from the latin word "noli" meaning not. As originally proposed to the BBC by Tami Munford, Harwood Union High School latin teacher.
A slightly different take on Pink Floyd's 1987 album "A Momentary Lapse of Reason", used to describe the process in which the male anatomy overrides all rational decision making. Similarities can be drawn to "the heart wants what the heart wants", but "what the penis wants" is more powerful, visceral, and immediate.
Jack: Dude, you must have been beer goggling last night. That girl was such a butterface!
Jim: Yeah, I had a momentary lapse of penis.
John: Why the hell did I out my crush like that and admit to having all these feelings...I don't even like her that much!
Jake: Blame it on a momentary lapse of penis!
When a persons thoughts are completely preoccupied with a person, place, thing or event but they forget about whatever was consuming their thoughts in an hour, day, week or month.
When, upon seeing your status on facebook or twitter, you cringe in shame, embarrassment, or both, then delete it... but reconsider and post it back a moment later, figuring to hell with it.