Armed to the teeth
Definition 1 of 1
Pro Tip 1/3Over-prepared
Used to describe excessive preparation or having more than necessary for a situation. 
He showed up to the camping trip armed to the teeth with gear.
Pro Tip 2/3Metaphorically Speaking
Often used metaphorically to describe non-physical items like arguments or emotions. 
She came to the debate armed to the teeth with facts.
Pro Tip 3/3Intensity Increase
Emphasizes the intense or aggressive nature of a person or situation. 
They went to the negotiation armed to the teeth, refusing to back down.