A few synonym:

A Message From Below
Affirmative Action
Air-o-gant Assault
Apocalypse Now
Baking Brownies (South Park)
Barked
Barking Spider
Bathtub Jacuzzi
Bench Burning
Bench Warmer
Biological Warfare
Bips
Blast
Blow-Holes
Blowing Ye Butt Trumpet
Bottom Belch
Botty Burp
Breaking Loose
Brown-Speak
Bucksnort
Butt Babble
Butt Chuckling
Butt Thunder
Chair Charring
Cheesers
Chinese Barking Spiders
Colon-Speak
Crack Splitters
Cracking a Rat
Creaky Floorboards
Cutting the Cheese
Disappointments From Down Under
Draw Mud
Dropped a Shoe
Elevator Evacuation
Fermented Revenge
Firing Scud Missiles
Flatulence
Floating an air biscuit
Fluff
Fragrantly Impaired
Framping
Gassius Assius
Gastronomically Expressive
Gravy pants
Grep
Guff
Gusty Windflap
Gut Belch
Gut Bubble
Happy Honkers
Heinee Burp
Hotties Inverse Sniff
Inverted Belching
Janet
K-Fart
Methane Exit
Mud Crickets
Mud Duck
My Opinion
Natural Gas
Nature's little surprises
Nature's musical box
Nuclear Farts- 40% fallout
Obnoxious Coughing
Odiferous Objection
Ooh, that's a nasty cough
Oops! I let Fluffy off the leash
Paint-Peeling Predicament
Pant Stainers
Panty Burps
Phoofs
Poots
Pull My Finger
Rancid Reaction
Rancid Rebate
Rat Bark
Revolting Release
Ripping the seat
Rosebuds
SAV (Silent And Violent)
SBD (Silent But Deadly)
Sheet Ripping
Smelly Snoring
Speak To Me ol 'Toothless One
Stepping on a Duck
Stinkies
Stinky Sneezing
The Great Brown Cloud
There Goes a Mouse on a Motorcycle
Thunder from Down Under
Tooters
Tree frog
Trouser Cough
Trouser Ghost
Trouser Rippers
Trump
Tuba Tuning
Tunnel Trumpting
Unappreciated Air
UnderThunder
Unholy Airlock
Unsun Melody
Vapid Chatting
Vulgar Vapor
Waiting to Exhale
Who dropped their guts?
Who opened their lunch box?
Woofer

Not a bad list Gelan...but there is more:

Cough in ya Rompers
Puff a Dart
Tear one off
Keep calling Sir, we'll find you
Love Call
Butt Burner
Cheek Flapper
Hemorrhoid Tangler
Paint Blisterer
Wall Paper Peeler
Furniture Shatterer
Gut Buster

I'll leave it for others to add to.

Cheers, Vince

Two more...TWO MORE before I can open the bridge, sir!

No matter how old ya get farts are still funny
Joe

homosexual mating call
thats your ring you better answer it

Turd honking for the right-of-way
Your voice is changing but your breath still stinks

short shredder
oh no! you pulled my finger too hard!
chinese air raid
belch that your friends can taste too
I hope that was just a fart...
pressure release valve

Fall in the Officers.