1. adj: Having a lot of fail, very/really stupid.
2. n: One who is very stupid, or who fails a lot at life.
From the words "hella" meaning: "a lot of, very, really," and "derp" which is often said after one has failed, pretty much meaning: "Something that was stupid/dumb,"
1. "Can you believe that helladerp test had 50 questions completely unrelated to what we were studying on it?!"
2. Person A: "Dude, I walked into a synagogue the other day wearing a swastika t-shirt and shouting "Hail Hitler!" lol Everyone looked at me like they were going to kill me!"
The ability girls and women have developed to hold several items at once in one hand. The skill has been developed due to the lack of pockets in women's clothing.
I thought she'd need multiple trips to carry her phone, keys, wallet, and Starbucks to her car since she needed the other hand to open the door, but she used her impressive girl grip to carry everything in one hand.