When praying, the unfortunate situation where Muslims, who are bowing or in prostration, have their pants too low and the individual behind them, is left to see their butt-crack.
Dude. I was praying and subjected to a wickedcase of prayer crack in front of me...
Derived from the Simpsons episode "Post Cards from the Wedge," a prayer block is done when one makes a prayer before another person and, on perpose, negating another persons prayer with one's own prayer.
ex. 1
Marge: (While praying) Dear Lord, please give my stubborn husband the wisdom to see that I am right as usual.
Homer: Too late Marge, I already use the prayer block on your prayer.
ex 2
Guy: Thank god I did a prayer block months ahead so the Yankees could win another World Series.
Someone who prays to God only when they want something as opposed to actually doing something about it, and otherwise does nothing else to further his kingdom. Typical behavior includes leaving their megachurch on a Sunday morning to have lunch at a restaurant and berate the server for working that day.
Here come the prayer warriors, everyone hide the gays and put out your cigarettes or we're all going to hell!