Not P but Moby-Dick (59)

[Mike Jing]

>From Chapter 81:

“Oh!  see the suds he makes! ” cried Flask, dancing up and down—“What a
hump—Oh, do pile on the beef—lays like a log!  Oh!  my lads, do
spring—slap-jacks and quohogs for supper, you know, my lads—baked clams and
muffins—oh, do, do, spring—he’s a hundred barreler—don’t lose him
now—don’t, oh, don’t!

 What does "pile on the beef" mean here?