A naval term used as an excuse by somebody who stumbles into the back of another person, often when
the penis of the stumbler is in a somewhat turgid state. The stumbler is blaming the way the ship is rolling about in what is probably a heavy sea.
The usual response to that involves a roll of lino. That is a comparison with a roll of linoleum floor covering, i.e. something hard, thick and long. That may be a warning to not do it again, or a thinly veiled
invitation to do it again, only more
deliberately. Nobody knows which is which until they respond in the wrong way.