The act of two, often partnered, homosexuals 'having a dommy' or 'having a domestic' i.e arguing about meaningless subjects or trivial things. Pettiness. But usually results in average or mediocre intercourse leaving both participants feeling disappointed but slightly less angry.
"Be careful, them two, the Shaun Jake."
Or
Person 1: "what's the matter with them?"
Person 2: "They're just having a Shaun Jake."