It's the Brazilian Wondering Wandering Spider. Its venom is one of the deadliest in the world. You'll get an erection before dying because the venom causes blood vessel dilation.
I've heard that it's not super uncommon to find foreign spiders in supermarket produce. I'm not sure about the erection-inducing kind though. (I guess they're not sending their best...)
The researchers are testing a new drug derived from the venom of the Brazilian wandering spider (Phoneutria nigriventer), also called the banana spider because it is sometimes accidentally exported in banana shipments. It is one of the most toxic species of spiders in the world.
Among other symptoms — including increased blood pressure, nausea, abdominal cramps and convulsions — this spider's bite can cause a "prolonged and painful erection, which can lead to necrosis of the penis," meaning death of its tissues