We can lift you up, and help your day.
Sarcastically taken we can go either way.
Short as a whole, lengthy in the middle.
Six letter word brings laughter to this riddle.
What are we?
(In reply to
solution by Billy Bob)
I think 'smiles' rather than 'smile' would be the answer. The
first word of the riddle implies a plural ("We"). Finally, 'mile'
would truly be in the middle of the word.