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Universal hallway constant 

Generally denoted by K, the universal constant is used in calculating the proper density and distribution of smoke detectors in a house hallway. While the constant can not be mathematically derived, it's value has been estimated at 150, and has units of square feet/kitchen*staircase.
Dude, to be able to tell you how many smoke detectors you'll need, I need to know the proper universal hallway constant.

drops by to fart in the hallway 

When someone very rarely interacts with you on social media, but when they do it's to say something bitchy or mildly unkind.
Brodie likes to pretend we're friends, but he only ever drops by to fart in the hallway.

Throwing a pencil down a hallway 

A Pencil in the hallway is when a man with a small to average sized penis engages in intercourse with a woman with a loose vagina.
"After she had her fifth kid, intercourse to her husband was like throwing a pencil down a hallway."

throwing a penny down a hallway 

when a girl's pussy is so loose from having sex so much it's like throwing a penny down a hallway
Damn shelly was a bad lay. It was like throwing a penny down a hallway

high school hallway 

dude the high school hallway was packed last night!