I'm down like a clown Charlie Brown

It's a reference to the old cartoon Charlie Brown.

"Sounds like a plan Stan."
"I'm down like a clown Charlie Brown."

third down brown

penetrating someone twice in the vagina followed by a sudden switch to the ass (then usually shouting TOUCHDOWN)

dude, i totally gave her a third down brown last night

went down like bobby brown

Having sex with a feminist, who removes your testicules, thus making you a homosexual, and engaging in lewd sex acts.

* no relation to singer/crackhead Bobby Brown

Comes from the song by Frank Zappa

After that dyke cut Jim's balls off, he went down like Bobby Brown, and shoved a pineapple up his ass.

down to get brown

To get naughty and or do drugs

Sure I'm down to get brown tonight ,

Down in the brown

When your cell phone accidentally falls into the toilet.

I finished my morning sit down, got up and heard the splash of my cellphone going down in the brown.

Down to Brown

When you're into anal sex.

Guy 1: You down to brown? ;)
Guy 2: Mmm oh yeah, that's one of my kinks!