Sling off at
Definition 1 of 1
Pro Tip 1/3Negative Tone
This phrase usually shows the speaker has a negative opinion or disrespect towards the subject. 
Helen can't help slinging off at the new policy.
Pro Tip 2/3Informal Use
'Sling off at' is casual and can be rude; avoid using it in formal or polite conversation. 
I shouldn't have slung off at the referee during the game.
Pro Tip 3/3Person or Thing
The phrase can target a person or any other entity, like a policy, event, or object. 
His habit of slinging off at the weather is quite tiresome.