Attempting to ascertain the imagequality yielded by a digital camera or lens by close inspection of its output at 100% zoom (or greater). Some consider this behaviour to be obsessive.
I've been pixel peeping to see how sharp my new lens is.
One who spies on others while they are engaged in some sort of lewd behavior. Stems from the legend of when Lady Godiva rode through the streets of a town nude. She had instructed the townsfolk to not watch her, but one, known simply as Tom, peeked and was immediately blinded.