"yea how cant you, they are love drunk"
To compare, it's like literal drinking. After sixteen beers (or kissing, snuggling, sex, or otherwise romance in general) you can't simply stop drinking and decide you're no longer drunk, you will still feel the affects of said drinking (or again, in this case, kissing, snuggling, etc.) and must slowly wind down from the earlier events.
"I know, I want you back so badly.. I'm completely lovedrunk right now.."
-when the company of such person leaves one feeling weak in the knees; often accompanied by blurry vision and an increased heart rate.
-in extreme cases one may experience total loss of motor skills as well as kaleidoscopic vision while in a state of love.drunkedness.