What does the following sentence mean?
"He’d hung up. Really, very grumpy. Maybe he was having problems with irregularity. Evelyn would recommend a high colonic. "
the sentence cited from the book The Erdmann Nexus by Nancy Kress
could someone to help me understand the two words-- "irregularity" and "high colonic". does irregularity means irregularity life that makes him grumpy? Thanks!