To '
Base Up' refers to one of three things.
1. The application of hand sanitizer (from the
base to the
tip, hence the name) to ones genitals before or after a particularly questionable bout of intercourse (though a post-coital 'base up' is less likely to result in unwelcome friction).
2. In reference to the sexual encounter itself, whereby you engage in risky business and
will likely require the application of 'Base Up' in the near future.
3. As a noun referring to the sanitiser itself.