“Run lines in your trailer” is an innuendo said by Wallace Wells to Todd Ingram in the Netflix show: Scott Pilgrim Takes Off. It is used to suggest a very hot on-set affair.
Todd: what just happened?
Wallace: Not sure. Want to run lines in your trailer?
A code phrase for when you and your partner are actors for a movie but you get to take a break by having sex with them in a production trailer, as seen in the Netflix series "Scott Pilgrim Takes Off".
"Hey, so, um so, so quick question, um about the script?'
"Run lines in your trailer?"