As adjectives the difference between loopy and gloopy
is that loopy is having loops while gloopy is (informal) having a glutinous, sloppy consistency; gloppy.
loopy
English
Adjective
(er)
having loops
:A loopy rollercoaster.
(slang) idiotic, crazy or drunk
gloopy
English
Adjective
(er)
(informal) Having a glutinous, sloppy consistency; gloppy