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1.
When two males gingerly touch tips as a friendly gesture. Somewhat like a hand shake.
Bob and Farley had an erection connection after lunch.
by Huava April 17, 2009
 
2.
when you notice someone staring at you from across the room whom most likely has a boner from your attractiveness.
"Don't look now, Sally. There's a guy over there who's making an erection connection with you and he's not sexy."

"I think that old man overheard our conversation about giving blow-jobs. Look how he's making an erection connection with our table. Another round of margs, please!"
by Haylst0rm June 17, 2013