Gag a Maggot (Slang) Expression used to describe something extremely revolting or disgusting. 

Look at these two? Doesn't it just make you sick? They wear work-out-clothes in public. They shop at the farmer's market. They carry their own bags. Jake buys Reese flowers. They put their arms around each other -- IN BROAD DAYLIGHT.  

Gag a maggot, I'm gonna be sick. They're so goddamn cute together I could hurl. The only thing missing here are frolicking puppies, a meadow, and a goddamn rainbow with a pot of gold at the end. Jesus, I loathe them and their infinite amounts of joy. I hope a drunk geriatric falls asleep at the wheel and plows them down Final Destination style.