It’s about time. We are now on Instagram!
"empty talk, nonsense," 1888, from earlier sense of "puff of air" (1825), of imitative origin.
To lie; exaggerate; bullshit: Quit your guffing and tell it right
[perhaps fr Scots gaff, ''loud, rude, merry talk''; gaff in the first sense, now obsolete, is found by 1825]