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1. Someone who lives in a "world" where videogames are the most important thing ever. Xbox games specifically. This person is so involved in videogames that they forget the rules of basic hygiene. This person usually wears the same set of clothing for weeks at a time without feeling the need to wash it. The stench of this person can get so bad that it engulfs the entire room, and remains lingering even after the person leaves.

2. Someone who pretends to like box, but in fact hates it. This person would usually prefer a granddaddy penis in their mouth.
1. Dude, you've been playing COD all day. Take a shower and quit being a jeffbox.

2. Dude, that kid's such a jeffbox! He just told me he'd totally bang your sister, but then he was checking out your Dad's ass! Fucking GROSS.
by BaconFlavoredCoke February 25, 2009
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Sep 9 Word of the Day
the thing that you don’t have when you’re phones percentage is over 20
phone: why don’t you go to sleep tommy it’s 2 in the morning?
tommy:why don’t you die you dumbazz
by lik_frls_dis.me February 12, 2020
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2
Being a simp,Mexican,or gay with the homies
Quit being such a Jeff box, and hang with the boys
by Sk11py February 14, 2021
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3
Being a simp,Mexican,or gay with the homies
Quit being such a Jeff box, and hang with the boys
by Sk11py February 14, 2021
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4
A Jeff box is one who is always playing video games. He never leaves the house without his Xbox. He typically never showers and is one to leave the room while you can still smell him. He is the one that is always third wheeling and never gets the hint to leave you two alone. A Jeff box is the one who is most definitely gay but when confronted he becomes angry and tries to divert the attention to someone else.
Dude take you and you Xbox and leave me and my girlfriend alone. Take a shower too because your being a real Jeff box.
by Motopro08 February 21, 2021
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