This is the 42nd most frequent Slovak word.
toho
"Toho" in Slovak means "that" (genitive singular masculine or animate).
Here, 'toho' functions as a partitive pronoun referring to an indefinite amount or quantity of 'work' that won't be accomplished.
Mám veľa práce, takže na záhradu dnes toho nestihnem.
I have a lot of work, so I won't manage to do much in the garden today.
In this case, 'toho' is used as a demonstrative pronoun in the genitive case to indicate specificity of 'man'.
Toho muža som včera videl v parku.
I saw that man in the park yesterday.
Here, 'toho' functions as a demonstrative pronoun in the genitive case referring to something previously mentioned or understood in the context.