think he means like 'corrosive' , something or some1 that only possesses the capability to destroy or to spoil aldo...........

ha ha ha oh dear i realise now who use this forum they dont know what is meant by someone being toxic oh dear !!!!!
for info Albert:
this is from online
thesaurus : I deleted the part where it says : see fazakerly red
harmful - causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking"
unhealthful - detrimental to good health; "unhealthful air pollution"; "unhealthful conditions in old apartments with peeling lead-based paint"
noxious - injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas"
atoxic, nontoxic - not producing or resulting from poison