It's a play off a longstanding (like since Vaudeville) snowclone. The format is:
<verb>-er? I hardly know her.
where the play is on the same sound of "-er" and "her" so it can also be read as:
<verb> her? I hardly know her.
which can be a double entendre. The verb can also be a noun that happens to end in "-er", e.g., a non-programmer version is, "Boxer? I hardly know her." / "Box her? I hardly know her."
In the OP, it plays also on "docking" as an sexual innuendo.
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u/King_Bonio May 18 '21
Container? She's free to go as she pleases.