A slightly derogatory way of calling someone a conservative or similar.
Refers to President Dwight D. Eisenhower; 34th president, republican.
Don't be such an ikeman.
ikeman is a misspelled reference to the famous Nazi concentration camp leader Adolf Eichmann who was responsible for the murder and deportation of hundreds of thousands (if not millions) of Jews in Europe between 1934-1945.
The television show "South Park" makes light of this reference in several episodes.
hippie: Don't be such an Eichmann, man!
ikeman: Shut up hippie!