ad pick up
can you post the link to the job posting; might be easier to decipher the meaning to see the context in which they are using the term.
EDIT* from what i can see, ad pick up would be the process of sending the ad out to the corresponding publication to be published...usually by uploading the file(s) to the publications FTP site or emailing them. So, it appears to be more of a production type of position rather than a design-based (ie actually designing the ads) position....