這廝

this so-and-so

(pronoun) this; these / (bound form) this; the (followed by a noun) / (bound form) this; these (followed by a classifier) (in this sense, commonly pr. [zhei4], esp. in Beijing)

mutually / with one another / manservant / boy servant / guy (derog.)

(bound form) together; each other / (bound form) male servant / (bound form) dude; so-and-so (used in 那廝|那厮[na4 si1] and 這廝|这厮[zhe4 si1])