This person is characterized by asking for constant piggy-back rides, always hugging, or attached in some way to their boyfriend/ girlfriend. This happens often enough to become awkward to other people near-by.
A Mochila is generally female due to "mochila" being a feminine word in the Spanish language, but is not at all uncommon in males.
Student: "Whoa! Here comes a Mochila!"
2. in english, a very rare and exotic name/nick-name for highly selective individuals, including the remarkable fellow, Hansen
2. Hey Jessie, that Mochila guy is one hott mutha