This is a term used by pornhub it is basically for any of the ads on the top of the videos saying that you don’t have to sign up to go on this other website and ... it’s not bullshit
“Horny moms in your area no sign up no bullshit”
“Wow I’m convinced... wait mom! Why are you the first one on this site!!”
1. Putting yourself or someone else on a list for an activity, class, etc.
2. When someone is instant messaging you and they suddenly sign off because of something you say (similar to "hang up" on the phone)
guy1: i heard this year mr. herbert is teaching woodshop.
guy2: i have to go sign up for that class!
girl1: what happened last night? you totally signed up on me!
guy3: sorry, my internet connection is horrible.