To eat in bed immediately after fapping or having sex.
Cum sesh so good we both had to cum and crumb
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.