A lumpy Julia
A lumpy Julia is when a guy is pounding a girl's butt with his penis and then slaps his nuts into her ass like it's a surprise party.
My cousin's dog just did a lumpy Julia on my sister's leg.
He did a lumpy Julia on her and then laughed like it was the funniest thing ever.
That guy did a lumpy Julia on the barista and she spilled coffee everywhere.