Someone you live with in your dorm/apartment/house/
suite etc. during your college-life, or real-world life. He/she will ultimately become either your greatest enemy or your best friend, though the latter has a
slim chance of happening. IF you can avoid the first, find someone whom you 1) can bond with instantly 2) have share the same field of study (in college) or work, and 3) can trust. Keep in mind, however, that this privilege of choice more openly comes to you after your
freshman year of college.
Dude 1: I hate my roommate. He's so
shady, he "forgets" to pay his share of
the bills, we're not in the same classes, and we never hang out! We have nothing in common!
Friend 2: Aw really? Well, my
roommate's the exact opposite of yours, taking everything you said into account. He's awesome! You should come meet him!
Dude 1: For sure! Maybe us three can room together next year!