Being bookchecked is very unpleasant. It is when you are carrying books and someone randomly comes up to you and purposely slams them down to the ground. They usually do not help you pick the books up.
Elaine:*walks in the hallway,carrying 3 books and binders*
Justin:*pushes them down*
Elaine: Aw man!
Other student:*walks pass* Haha you got bookchecked!
Elaine: F you! *attempts to bookcheck other person*
defined as the initial act of scoping out your restroom-stall choices. a person causally glances down at floor level, hoping to avoid an embarrassing and unwarranted entry into an occupied latrine.
"man, why don't people lock the stalls? i did a footcheck and thought it was empty, but when i opened the stall, i saw some guy in mid-wipe."
Royal Marine (British Special Forces). Known to each other as "Royal" but the rest of the British Forces know them as bootnecks. This nickname is derived from them cutting the top from a leather boot and wearing it like a modern neckbrace to stop sailors cutting their throat while they guarded officers on board British sailing ships in the days of old.
"Don't anoy those Bootnecks over there unless you want to wake up with a crowdround you!"