big boy voice 

A term people use to either make fun of someone when they talk too quietly or to make a point about someone's speech pattern.

Some Guy 1: "I can't hear a word he's saying!"

Some Guy 2: "Yeah! C'mon, Dan! Use your big boy voice!"

OR

Some Girl 1: "Did you hear how he was talking?"

Some Girl 2: "Yeah, he was so using a big boy voice."

Some Girl 1: "Ha, and he's only thirteen!"

big boy voice by Non-Supercilious October 24, 2009

Big Boy Voice 

The voice that underage boys use when trying to purchase anything illegal to them. It is attempted to be a deep and gruff voice.

Jake: Hey I was going to try and buy some beer....but I'm only 17.
Tony:Just use your big boy voice and you'll be fine.
Jake: Oh yeah, MY BIG BOY VOICE!

Big Boy Voice by Tony J. December 25, 2007

Big Boy Voice 

When some men artificially deepen their voice to sound more masculine and dominate conversations. Used when the man does not have enough intelligence to make a proper point. Causes the voice to sound nasal and flat but not resonant. As if the adenoids are overgrown. Damages the vocal chords. Mainly done by Merkins.

Merkin 1: Oh my God. I was like oh my God! (in an artificially deepened voice)

Listener: It sounds like you need your adenoids taken out Merkin to get rid of your Big Boy Voice.

Big Boy Voice by PMcDonald November 27, 2011