recherchez un mot, comme donkey punch :
 
1.
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
de theone1103 6 août 2012
 
2.
A command issued toward a potential administrator/administratrix of fellatio.
On the horn, bitch!
de Jeff O. 18 janvier 2003
 
3.
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?
de ClaraFloraKavy 20 mars 2011