RTO's definitions
To fail suddenly, unexpectedly and humourously without you or other surrounding parties initially realising your mistake.
*Following a breif period of silence where it dawns on everyone what an idiot Robin has just been*
Stu: Hey man, you're an idiot, you shot a cow on that one!
Stu: Hey man, you're an idiot, you shot a cow on that one!
by RTO October 30, 2005
Get the You Shot a Cowmug.