The erection won’t do you much good as you try to avoid going into respiratory arrest:

Symptoms may appear within 10 to 20 minutes after the bite, and death within two to six hours, where severe pain radiates to the rest of the limb, systemic effects include tachycardia, increased blood pressure, vertigo, fever, sweating, visual disturbances, nausea, vomiting, difficulty breathing and paralysis.

I imagine it would be kind of like the hypnotoad sound