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It's fairly easy to call up references to bongs on the internet.

Cypress Hill's rap Hits from the Bong is a famous musical reference to this form of smoking.
The guitarist of the Red Hot Chili Peppers, John Frusciante, can be heard taking a hit from a bong at the beginning of "For Air" on his second solo album, Smile from the Streets You Hold.

From same source: "A bong, also commonly known as a water pipe, is a smoking device, generally used to smoke cannabis,"

Another: Dr Bongs provides a complete range of cannabis accessories from all the old favourites to new and exciting ideas

I suppose that the expression "bong hits" is understood by just about everybody, except those who don't take the common meaning of word usage and apply it.

The principal of the school in this instance was right on target. It was not rocket science.

While it was perhaps immature and adolescent, it was still a pro-drug message, and the principal was correct in finding it disruptive.

Clinton would say, "What is the meaning of 'is.'"

Those who work with kids day in and day out know what's being said/implied/hinted at. Any court that wants to play foolish "what's the meaning of 'is'" games is discounting the obvious.

There are none so blind as those who refuse to see.

The Whole Wheat Bread song Grass features samples of bong bubbling.
In the beginning of "Left Hand Suzuki Method," a song by the Gorillaz, a water bong can be heard being lit and used.
In the song "Smoke Two Joints" by Sublime, a bong can be heard at the beginning of the song.
Immortal Technique mentions a gravity bong in his song Leaving the Past.
"Humanity's gone/smoked up in a gravity bong/by a Democrat, Republican, Cheech and Chong.
A bong hit can be heard at a break in the song "Shake Your Rump" on the 1989 Beastie Boys album Paul's Boutique. It is shortly followed by an explosive sound effect. The clip is often censored at concerts, and was replaced by a scratch breakdown performed by DJ Hurricane in the music video for the song.
In album "Dub Side Of The Moon", a dub remix of "dark side of the moon" by Pink Floyd,the remixed song "Money" uses a bong sound as loop instead of coins.
Seconds 28-39 of Madvillain's song "America's Most Blunted" featuring MF DOOM/Madlib(Quasimoto) features the sound of a bong being hit, most likely by MF DOOM himself
A bong hit can be heard at the end of the song "Among the Sleep" by the rapper Cage.
The Kottonmouth Kings have a whole song on their Koast II Koast cd, rapping about "Taking bong tokes".