A friend you only meet up with at a certain place, or for a certain reason. Sometimes used as a code word for a FWB
Joshua: I'll be seeing my Sunday Friend tomorrow night after work.
Adrian: But tomorrow is a Wednesday?
Joshua: Yeah, that's the only night we both have off.
Adrian: Oh.
Adrian: But tomorrow is a Wednesday?
Joshua: Yeah, that's the only night we both have off.
Adrian: Oh.
by WilCoMex December 28, 2020

For those still in school, this is the final day of summer vacation. It's like the Sunday feeling, but 100 fold. Usually consists of sitting around in your pajamas, reminiscing about the summer, insomnia, and a general feeling of the blues that summer is over. Probably the worst day of the year. May not always fall on a Sunday, but it's the same feeling.
After the excitement of summer break, all students must face Ultimate Sunday, the worst day of the year.
by tHobbs March 6, 2011

by openwindow August 5, 2011

When a girl takes out a vanilla ice cream cone and smears it all over her man's shaft and sucks him sideways.
by ShoreBobbyB January 24, 2016

Dare Sundays is another channel of the Janoskians. Where they basically do crazy ass dares their fans sent in, sometimes with other youtubers. They try to upload every week on a Sunday but that never really works and their first video was uploaded on a Sunday, so that's how they got their name...
by Aussie_Dreams October 8, 2014

When you get drunk on Saturday night and wake up late Sunday morning so you go get some good ass breakfast food and drink mimosas to get over your hangover
Adrian: *wakes up Sunday morning* fuuuuuuck I shouldn't have drank so much last night I'm so hungover.
Sierra: Wanna go get Sunday brunch?
Adrian: Yas.
Sierra: Wanna go get Sunday brunch?
Adrian: Yas.
by Orangecartoons5 March 4, 2016

A tag on twitter where , mainly posted on Sunday where people send seductive toned images, some images may have exposed nipples /genitalia
Layla: Why is there a nude picture of you on your twitter profile-
Kayla: Cause it's seductive sunday!
Kayla: Cause it's seductive sunday!
by Jacksonville739 February 16, 2020
