Dried, crusted semen that has flaked off into smaller pieces.
The sheets in the hotel room were littered with cum crumbs.
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The stuff left over in your cum sock after you use it.
Girl: I'm cold.
Guy: Go grab some socks.
Girl: Ew! What's in this one?
Guy: Oh those are cum crumbs, that's my cum sock.
To eat in bed immediately after fapping or having sex.
Cum sesh so good we both had to cum and crumb