Always happy to use my mastery of the English language to help out a club member sir.
Chicken**** is somethin' that's trivial or not important. For example: "This here thread is just chicken****."
Horse**** is somethin' that's not correct. For example: "It's horse**** that the United States should have to pay for a wall to keep the Mes'kins out of our country."
Bull**** is also something's that's not correct but takes it to a higher level of incorrectness ... perhaps even to an extreme. For example: "It's bull**** that illegal Mes'kins in this counry, or their dependents, get to stay here."
Hope this has been both educational ... and insightful.