In this passage:
Got a feature request? Found a bug? Think our mother is cheap? We'd love to hear from you!
What do they mean by "Think our mother is cheap?" there?
closed as too localized by MετάEd, tchrist, Matt E. Эллен♦, Cameron, Mitch Oct 22 '12 at 20:29
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That is a wry way of expressing that they welcome all feedback, including criticism.
If there is any idiom to be revealed, it is the general your mother ____, for instance:
From the link:
As Dave says in comment,
The expression apparently derives from "Cheap mother*", an expletive in common usage, the expansion best left unstated.