A knife. Termed "Mexican Dipstick" due to the amount of Mexicans (mainly those in gangs) who typically wield knives.
Primary function is to determine if the
person it is tested on (victim) is low on
oil (blood). A play on the "
real" dipstick, used to measure oil.
So I was walking to the 7-11 and some guy was like "Tennis Rules!" so I responded with "Tennis is for
bitches!". He proceded to pull out his mexican dipstick and
chase me for
2 blocks before he gave up.