spill guts
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spill (one's) guts
1. slang To speak truthfully and share everything one knows about something, especially a sensitive issue or a wrong one has committed. OK, spill your guts—I want to hear whatever you kids are plotting back there. I'm sorry, I didn't mean to just spill my guts like that. I hope I didn't overwhelm you.
2. slang To vomit violently and extensively. I've been spilling my guts all morning, so, no, I don't think I'll be in to work today.
spill one's guts
Sl. to tell all; to confess. I had to spill my guts about the broken window. I didn't want you to take the blame. Mary spilled her guts about the window. She confessed that she was trying to shield Bob.