On the horn 

On the phone; talking on the phone

A: She gave me her phone number two days ago
B: You had better get on the horn pretty quick if you want her to go out with you

On the horn by theone1103 August 6, 2012

on the horn 

A command issued toward a potential administrator/administratrix of fellatio.

On the horn, bitch!

on the horn by Jeff O. January 18, 2003

on the horn 

when the male penis is erected, sometimes "on the horn" is used to explain an inappropriate erection

1. I was on the horn, but she didn't even notice. (sad face)

2. Oh lordy, is he on the horn?

on the horn by ClaraFloraKavy April 5, 2011

get on the horn 

To use the telephone.

Hey Simpson, get on the horn and tell accounting we need more TPS reports.

get on the horn by famousramos June 11, 2004

lay on the horn 

To honk one's car horn for longer than normal. Usually done when either the driver is fed up or someone on the road does something particularly stupid.

The asshole cut me off, so I laid on the horn.

lay on the horn by The Grammar Nazi June 29, 2002

hit on the horn 

To make a phone call (mostly used by African Americans.)

A: "Yo... sorry I am late Bro."
B: "Yeah... I just was goin´ to hit on the horn."

hit on the horn by rperazag July 7, 2010

get on the horn 

It's getting the horn on , ie, an erection. Certainly I heard and used this phrase in the around 1960 - common UK working class phrase.

"I've got the horn." "She gives me the horn." "She gives me a horn on." (horn-on?)

get on the horn by Charlie June 11, 2004