To utter something in a particularly nasty or aggressive manner. In this usage, a noun or pronoun can be used between "snarl" and "out." He snarled out his answer at me, so I knew not to push him any further. I got so sick of the coach snarling orders out at us, so I quit the team.
snarl something out
to utter something by snarling or growling. Lefty snarled a naughty word out at the police. Walt the pickpocket snarled out a curse as the cop grabbed his coat collar.