'at your service' in words of Pierce Hawthorne, TV Series Community
character, thinking he's answering a lady.
Yep, he is such a charming old chap.
gay guy: "Excuse me, are you Pierce Hawthorne of Hawthorne Wipes?"
Pierce: "*At your cervix!* Oh sorry, I thought you are a lady. ...you can use that cervix line if you want."
meaning in a lot. as in up to one's balls.
J: guys wanna pre at my place tomorrow???
H: yes Jeff, I'm in!
B: And I'm in too Jeff
F: balls in!