When a guy is about to ejaculate from masturbating, he readies a "kleenex condom" - in other words, wraps tissue paper over the top of his dick, as to catch the semen and prevent making a mess.

It is named "kleenex condom" because it involves the use of facial tissue - Kleenex being a popular brand, and serves a similar function of a condom because it catches ejaculate, however Kleenex tissues could never actually serve the purpose of a real condom, and kleenex condoms SHOULD NOT be used as a prophylactic for sexual intercourse.
Jimmy yanked his Jimmy and then felt like he was about to come, so he quickly grabbed some tissue paper and made a kleenex condom on his ding-a-ling.
by Doo-da May 18, 2007
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