To sing or serenade into one's bumhole therefore mimicking the action of singing into a microphone that happens to be brown. Often ex-American/Canadian Idol stars are reduced to using the brown microphone since it is the only audience that is attentive.
Tariq: "Last nightt Clay Aiken sang an incredible melody into m'a brown microphone. It was stuck in m'a head awl day!"
Dwayne: "Damn nigga, that'sgross!"
A sexual act. When a man is engaged in sex in the doggy position, he inserts his penis into her (or his) anus and fucks them until he cums. Then withdrawing his penis and wiping it on her (or his) new light colored curtains. It usually ends with the other partner freaking the fuck out.
The often heardavalanche of faecal matter erupting from someone's bowels in a public bathroom...
A: "Dude i was just in the bathroom and the place shook with a damn brown avalanche!"
B: "Sick!"
C Walks in with a pleased grin on his face.
A: "Feeling relieved?"
C: "Oh yeah."