Mine are pretty simple:

barrel_racer100 - I love to barrel race, so I'm a barrel racer, and 100 just because I couldn't think of one, so my friend said 100

apcrs5122 - Pretty simple: A for Alex, P for Phoebe, C for Cleo, R for Rolo, and S for Scooter. 5 for 5 pets, 1 for 1 dog, 2 for 2 cats, and the other 2 for 2 guinea pigs.