My room mate leaves dirty condoms around what should I do?

SLAP her A**!!! let her know AGAIN!!! and if she don't listen maybe she needs to move out and get another roommate who isn't that DIRTY!!

Pick them up with her tweezers and deposit them all in her bed at the foot of the bed between the sheets so that if you complains that you did it, you can say, it's possible her bedmate(s) fell asleep with them in bed and they probably worked their way to the bottom and suggest that she should clean her sheets more often.