What does Benvolio mean when he says, "We'll measure them a measure and be gone" in Act 1 of Romeo and Juliet?

This line occurs in Act I, scene iv as Mercutio, Benvolio and
Romeo are preparing to go, uninvited, to Capulet's feast.  The have, as was a custom of the day,
entered masked, and are preparing to show up for free food, drink, and dancing with the ladies at
their table of the Capulets.

The line you quote appears in context
like this:

We'll have
no Cupid hoodwink'd with a scarf,

Bearing a Tartar's painted bow of
lath,

Scaring the ladies like a
crowkeeper,

Nor no without-book prologue, faintly
spoke

After the prompter, for our
entrance.

But let them measure us by what they
will,

We'll measure them a measure and be
gone.

What Benvolio is doing in the
first part of this speech is commenting on how there won't be a great to-do over their entrance,
no pomp and circumstance, because they are, in effect, uninvited
guests.

In the final two lines, he's playing with the different
meanings of the word "measure."  In paraphrase, Benvolio says, "Let them judge us ("measure us")
however they want, but we're going to give them (""measure them") a dance ("measure") and then
leave."

For more on this scene, please follow the links
below.