IPA: /ˈdʒæm.ə.bəl/
KK: /ˈdʒæməbəl/
Something that can be blocked or stuck, preventing it from working properly.
The printer is jammable when too much paper is loaded at once.
Jammable is formed from "jam" (of uncertain origin, possibly from Middle English *jamme*, meaning to press or squeeze) and "-able" (meaning capable of). The word "jammable" means capable of being jammed or pressed together.
Think of something that can be 'pressed' or 'squeezed' — that's what 'jammable' means, something that can be jammed.