see also compounds at ballock n.
[2000s] nothing at all.
[1990s+] the scrotum, container of testicles.
[1960s+] a general term of abuse; thus bollock-brained adj.
[1990s+] a derog. term of address.
[1990s] a general term of abuse.
see sweat one’s arse off under sweat v.2