Idiom (?) "just for the heck of it"

[angelafreitas]

Dears,
Please, what the mean of "just for the heck of it". For example in "... they purchased things just for the heck of it" ?
Thank´s a lot!
Angela Freitas
from Brazil

[curmudgeon]

Same as Just for the sake of it. For no particular reason. Because they could

[eworthy]

American Meaning: if you do something for the heck of it, you do it only because you want to or because you think it is funny or on a whim.