Sentence:  Mostly these portable toilets are just thin molded plastic ... But at construction sites, we sheet-metal the sides. Cladding, it's called. Otherwise, people come along and punch holes through them. ... Or kids will come along and <WSD>huck</WSD> rocks through the roofs, just to hear the sound it makes. 
Meaning of the word marked with <WSD> tags:  To throw or chuck.