A
German Crossbow is a male masturbation act in which the individual inserts a toothpick (preferably the club
sandwich style ones with the frilly
plastic ends to stabilize the flight pattern) into the urethra and "fires" said toothpick via ejaculation.
"Watch me pop this balloon with my
German Crossbow."
"My
girlfriend has to wear an eye patch due to an arrant
German Crossbow."
"The only thing that gets me off nowadays is a German Crossbow."
"Hey, hold my beer and watch me fire my German Crossbow."