an outhouse or latrine: a rudimentary outdoor toilet(Britain, Australia, slang • In the old days, when there was a corrugated iron thunderbox, the Holts′ guests were told to approach it with caution: where other thunderboxes had redback spiders, the local ones tended to have taipans.wiktionary.org • The first are the pit toilets — “thunderboxes” — boxes painted white inside, centrally located in various sections of the campground. The second type of toilet looks like a thunderbox but houses an odour-free flushing toilet. • He boobytrapped the ‘thunderbox’ and the next guardsman who sat down was met by a deafening blast. The guardsman and plastic loo seat were hurled one way, the loo paper another, but there were no injuries. • And finally he pointed to an old thunderbox and shovel. ‘Our toilet block.’); a portable boxlike lavatory seat that can be placed over a hole in the ground(by extension, any portable lavatory collinsdictionary.com)
wiktionary.org • The first are the pit toilets — “thunderboxes” — boxes painted white inside, centrally located in various sections of the campground. The second type of toilet looks like a thunderbox but houses an odour-free flushing toilet. • He boobytrapped the ‘thunderbox’ and the next guardsman who sat down was met by a deafening blast. The guardsman and plastic loo seat were hurled one way, the loo paper another, but there were no injuries. • And finally he pointed to an old thunderbox and shovel. ‘Our toilet block.’); a portable boxlike lavatory seat that can be placed over a hole in the ground (by extension, any portable lavatory 