Or as the younger generations write it; "ghey", so the auto-moderating software doesn't delete their post. There is an increasing amount of slang and acronyms that online posters use to get past censors. 304 may be the signature term for the online generation and Big Brother.
For those that don't know, a 304 is in reference to a "whore", shortened to "hoe" but inverted and reversed to read as "304", pronounced "three oh four", not "three hundred and four".
"304" in this use is not to be confused with the reference to the different 304 cubic inch V-8 engines made by International Harvester or AMC.
Take a look at the kids on the street
No, they never miss a beat
-'Never Miss A Beat' by the Kaiser Chiefs
https://www.youtube.com/watch?v=dncVF5Xj4eU
L7 referred to the square formed by holding the left hand with the pointer finger extended straight up and the thumb to the right and the right hand with the pointer finger straight down and the thumb to the left.
One could silently call another a "square" using only the gesture. L7 was in contrast to someone who was "hip".
'Woolly Bully' by Sam The Sham and The Pharoahs
Hatty told Matty, "Let's don't take no chance
Let's not be L-seven, come and learn to dance"
Wooly Bully, Wooly Bully
https://www.youtube.com/watch?v=Pv5cXss5cPg