Would probably stretch to fit this usage.

Priapic is a synonym for phallic:

adjective

1. (sometimes initial capital letter) of or relating to Priapus; phallic.
2. characterized by or emphasizing a phallus: priapic figurines.
3. (of an image) suggestive of or resembling a phallus by its shape.
4. a way of getting over the exaggerated concern about masculinity and male sexuality.

(Word dictionary) Why

is persistent erection termed as an issue of runningdy behavior? How can I contribute to com(.com) ). However, it is sometimes used figuratively, and in a way similar to the desired sense. ^Why

is Architectural Priapism used to describe skyscrapers, popularized (coined) by Leon Krier and made memorable by his cartoon of the London building known as the Gherkin’s.

A custom “ultimate hot-rod” was actually called the Priapism. An art

critic for the Observer talks about the “modest priapism and slight swagger” of an installation featuring candlesticks set on high stools to depict revolutionary leaders. This last example is particularly useful, as it hints at the term’s utility for expressing the degree to which an object is phallic.

So for the OP’s example, one could say

This beer stein’s priapism (that’s over the top), is over the top.

^The phrase also used figuratively to mean something like aggressive-masculinity or aggressive excitement, as in this JSTOR Daily article (“capitalist priapism”) or this history book (France’s “political priapism”).