Scupper scissoring

When two ships (especially cargo and tanker ships) with their front scuppers made contact together and rub, similar how lesbians made contact and rub their vulvas

P1: you would not believe what I saw yesterday at the port

P2: what?

P1: two ships were scisssoring

P2: so two lesbians were rubbing their vaginas on a ship?

P1: NOOO not that type of sissoring , So at the port a green container carrier and a reddish-Orangish LNG was scupper scissoring together untill they actually collided each other and start to sank