Third cartoon in and already a horrid pun. My bad.
If you're not familiar with the term "bithead," it is sometimes used as a semi-derogatory reference to programmers. I would consider it a term of endearment IMHO, since coding in machine language (actually using bits to write programs) is pretty hardcore and time consuming. Imagine having to write this all day:
00101100010001011010111011011101 101010110111101001 101010110010110101010101 101010101101 1010101 1010101 10101010101001 10101010101 11010101100110 1010101010101010101011 101010101010