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2.
To attempt to participate in a conversation while still listening to headphones in one ear, in an attempt to look cool and aloof. The action often generates contempt for the half-speaker.
"God, I'm sick of Hamish and Joseph half-speaking all the time!"
by Fukwit Fred January 17, 2006
 
1.
Saying something that only gives a small amount of actual information; speaking without depth, detail or reason.
You said the problem with the company is leadership, but that's just half speak, it's a general statement without any real information.
by Sara McCracken March 13, 2011
 
3.
To understand so many languages that you get confused.Therefore,you half-speak it.
I half-speak German, Italian, and Japanese.
by waterdude125 June 23, 2011