This is a complete guess but maybe he's referring to interactions where he (in his mind at least) catches a woman's attention but it's just a momentary encounter. The Asian girl on the bus probably counts as a "catch and release" to Lucas' mind, as would a girl he imagines blushed at him on the sidewalk, or the cashier girl's hand brushing his as she hands him change, etc. All these nothing interactions which, if the other party even remembers it, they only considered an unpleasant brush with a creep. Lucas' delusional optimism and wishful thinking magnify these non-incidents, which are neutral, brief, and/or imaginary, into a meaningful connection. Lucas is so starved for social interaction, in particular female romantic attention, that he will transform any moment where an attractive young woman barely interacts with him, into his own narrative of: "Man that hottie was secretly into me, too bad she couldn't say anything because, uh, um... and I couldn't say anything because I, um, I uh... she was totally into me though."
This of course begs the question, one of the biggest and most flagrant holes in Lucas' narrative, why (assuming we go along with his version) would he not try to capitalize on this potential bae's apparent interest in his Gen X telomeres? If they are indeed caught why "release"? He has spent all day every day for a decade bitching about how badly he wants and needs a girlfriend. It's just so bizarre when he occasionally drops these delusional brags about hotties in the street dripping for him while he does nothing about it, then goes right back to "you need to find me a wife". And he's so monumentally stupid that he'll post this shit and expect us to read it and be jealous of him. We were supposed to read that and think damn, Lucas has smoking hot Asian chicks creaming over him, I'm so mad and jealous, I wish I wasn't a meth smoking Republican homeless misogynist Christian with a baseball cap.