A quick and discrete method of informing someone who is about to answer the phone that you're "not here." Traditionally, once you've declared your 78 status (simply by saying the number when the phone rings), the person answering is required to inform anyone asking for you that they've not seen you since 1978. In some cases there is leeway for alternative responses (as when the person on the other end may be familiar with 78) as long as you are protected from having to take the phone. If everyone in a room calls 78, the last person to call it must answer the phone.

An override code is also sometimes used. This is a predetermined year (post-78) that friends can use to override 78 and reach you in an emergency. The correct usage of the override is to tell the person who is answering "You're no help then; I was talkin to him in 83 (or 84, or whatever you've picked)"

*ringing phone*

Gringa: 78!
Greggo: 78!
Jeremy (being the only one left, answers the phone): Hello? Greggo? I ain't seen Greggo since '78. Sorry.
by C7Ringo January 30, 2006
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78 refers to something being cool or awesome.
sometimes referred to as 'page 78'. When used as 'page 78' it refers to calling someone nerdy.

Note: When speaking of 78 one usually makes the gesture of pushing up their glasses with their index finger. This occurs whether the person wears glasses or not.
Dude! that's 78!

Example(page 78):
Guy 1: Hey the answer to that is on page___
Guy 2: what did you like read the whole textbook or something? where's the next answer? page 78?
by Nick Neveux February 21, 2008
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78 RPM Record that is played on a turntable. That type of record is very old and most young people today have probably not heard of it!
Some people still listen to old 78s.
by SamTheMan1689 November 18, 2012
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User1: hey,

User2: hi..
User1: my girlfriend watched her brother get a 78
User2: FAF
by djnight December 19, 2010
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Masturbating once at One o'clock, twice at Two o'clock, three times at Three o'clock until twelve at Twelve o'clock. In total 78, good challenge.
Me: I have only ever Consecutively fapped 7 times in a single day.

Friend: if you think that is bad, try the 78.

Me: what's that?

Friend: look at this page?


Me: my gosh

Friend: I know right?
by Rade Tabooty June 14, 2014
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78, a gang located in Buena Park , CA established in 2015 with approximatly 30 members. Their territory stretches from knott ave to the easy side to valley veiw t the west side and La Palma ave on the south side and touching Thelma on the north side. 78 represents the 7800 block which all of the addresses are in this area.
Aye you know that one foo, ohh shit yeah from 78?

Damn man they always be posted in 78
by BlocboyjbFROM MARS March 21, 2019
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78 is similar to 69, 89, or 39, but it's hammer rape. the seven represents a hammer, while the 8 is a butt.
Grace: "god! i hate that man!"
Julia: "we should 78 that douche bag!"
by ShaNayNay Quan April 9, 2009
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