I have 8 earlobe piercings, a helix and a navel piercing. No-one has ever asked what they "mean" though me being a girl may have something to do with that. Ironically two of my piercings I got to commemorate events, the helix was for one of my birthdays (my piercer gave 1/2 off on your birthday, too) and the navel I got to commemorate raising $2000 and walking 60km (in August, in two days) for a cure for Breast cancer.
Maybe you should make up something like "I got this one to commemorate climbing Mount Everest."
