Place about half the cucumbers, tomatillos, onion, poblano, and all the garlic in the blender jar.
Add all the olive oil, rice wine vinegar, parsley, and cilantro into your blender.
Blend on high until the ingredients are mostly puréed.
Add the remaining cucumbers, tomatillos, onion, and poblano to the blender and blender on high until very smooth.
Taste and season with salt and pepper.
Chill in the refrigerator for at least 2 hours and up to overnight.
Garnish with chopped cilantro or finely diced tomatillo. Serve with tortilla chips.