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built-in babysitter 

A older child or grandparent that is expected to babysit often
You have a 18 year old daughter that is expected to be a built-in babysitter and watch a younger sibling even though she already has plans
built-in babysitter by ldjfreeze December 30, 2013

built in bestfriend 

Is a forever person u can talk to and come to that will always be there and is apart of you. A special person.

built in hardrive 

when you go on a date with a girl but she already has a vibrator in her
man: want to go on a date
woman: yeah sure let me get my built in hardrive
built in hardrive by King Smurf November 23, 2018

built-in swimming-trunks 

A.k.a. thighs --- a guy can temporarily hide his "junk" by tucking it back behind him and then pressing his thighs together, so that he is at least a little more "decent" if he's unexpectedly "caught in the buff".
A gal doesn't really have much of anything particularly "obvious" to hide "down there", so she wouldn't need built-in swimming-trunks; now, if only she had something "up top" to hide da "baby-feeders" in an emergency... I guess her arms and hands can sometimes adequately suffice, although that is usually only effective if she's fairly "small" in the "girly" department.

built-in back-rub reimbursement 

AKA "boobies", particularly if they're C-cup or larger. As we all know, a guy will grant 'most any ordinary request from a buxom gal while she's nestling her ample chest-pillows against him (especially if it's direct skin-to-skin contact), and so as long as she lovingly clasps him in her arms and "supplies" him with her soft warm comforting ta-tas pressed firmly against his chest as "payment" for his efforts, he'll keep massaging her back.
I sometimes get totally achy arms from giving Tiffany a three-quarter-hour-long back-rub, but how can I stop when she is continuously "recompensing" me for my services with her built-in back-rub reimbursement???

Built-In Oxford Dictionary. 

That nerd has a Built-In Oxford Dictionary.