冲凉 is a colloquial verb-object compound (离合词) meaning 'to take a cold shower' or more generally 'to shower', common in southern China, especially Cantonese-speaking areas. As a separable verb, the object 凉 can separate from 冲 when inserting measure words, durations, or complements — for example, 冲了一个凉 ('took a shower'), 冲完凉 ('finished showering'). The verb is intransitive; you don't put a direct object after it.