Slang for the musical instrument, trombone.
Trompwns absolutely pwn all other instruments with trompwn suicides and lame sexual jokes.
Trompwn player - Wanna hear a good pickup line?
Regular Guy - Ok, sure
Trompwn player - "Hey baby, Trompwns do it in all 7 positions"
Regular Guy - Wow, that simply pwns all other pickup lines. I wish I could play the trompwn..