They seem to get along fine most of the time when politics isn’t on the table. But what I more meant was that Mark and Mike both have adult lives – respectable jobs, relationships, a kid in Mike’s case. Zonker is literally existing in a kind of perpetual adolescence where even having a job is out of the question. (I love Zonk, but he is a permanent manchild.)
Penis-like, basically. ‘Phallus’ means penis (or, anatomically, a penis or a clitoris – an erectile sexual organ, anyhow.) Lacey is saying the shape and uprightness of the Monument evoke the mental image of an erect penis. Which is true, to be fair to her. She just wouldn’t have said it out loud in the past.
*Yale.