So I also learned this version. A long game of telephone from Girl Scout to Girl Scout relayed the song a lot differently. We’d go through three rounds of the song, each varying slightly than the initial lyrics. Highly catchy, extremely annoying... but I’d love to know the full thing, if there are more verses to this version or if you can add to the lines that I am missing in the second round; that would be a huge help. Thanks!

Round One

(To be sung between multiple people. One as the leader says, “this is a repeat after me song.” To which the others in the group reply with, “This is a repeat after me song!” A bit louder than the leader.)

“This is a repeat after me song!”

“This is a repeat after me song!

My highland goat
was feeling fine
ate all my shorts
right off the line

I grabbed a stick
and gave a whack
and tied him to
a railroad track

a whistle blew
the train grew nigh
my highland goat
was sure to die

he gave a groan
of mortal pain
coughed up my shorts
And flagged the train, Begin again.

Round two

(To be sung all together as a group.)

My highland goat, not a chicken but a goat.
was feeling fine, had a glass of wine.
ate all my shorts, red, white, and blue.
right off the line, ‘twas made of twine.

I grabbed a stick, not a branch but a stick.
and gave a whack, smack! Smack! Smack! Smack!
and tied him to, with a knot, not a noose.
a railroad track, (not a road but a track?) [Not sure on this one.]

a whistle blew,
(?)
the train grew nigh,
(?)
my highland goat, not a chicken but a goat.
was sure to die, goodbye goodbye.

he gave a groan, OH! (to be yelled out in anguish)
of mortal pain, OH! (A little more anguish)
coughed up my shorts, red, white, and blue.
And flagged the train, begin again!

Round Three

(Again, sang as a group)

My highland goa-y-oaty-oaty-oaty-oat
was feeling fine-y-iney-iney-iney-ine
ate all my short-y-orty-orty-orty-orty-orts
right off the line-y-iney-iney-iney-ine

I grabbed a stick-y-icky-icky-icky-ick
and gave a whack-y-acky-acky-acky-ack
and tied him to-y-ooey-ooey-ooey-oo
a railroad track-y-acky-acky-acky-ack

a whistle blew-y-ewey-ewey-ewey-ew
the train grew nigh-y-ighey-ighey-ighey-I
my highland goat-y-oaty-oaty-oaty-oat
was sure to die-y-iey-iey-iey-ie

he gave a groan-y-oany-oany-oany-oan
of mortal pain-y-ainy-ainy-ainy-ainy-ain
coughed up my short-y-orty-orty-orty-orts
flagged down the train-y-ainy-ainy-ainy-ain